MA094 Part 2 - Beginning Algebra Summary
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1 MA094 Part - Beginning Algebra Summary Page of 8/8/0 Big Picture Algebra is Solving Equations with Variables* Variable Variables Linear Equations x 0 MA090 Solution: Point 0 Linear Inequalities x < 0 page Solution: Ray 0 x 7 Systems of Linear Equations page 7 y 5 Solution: point, infinite points or no points y x page 5 Solution: Line y x Solution: ½ plane y x page 7 y x + Solution: point, infinite points or no points Quadratic Equations x +5x page 5 Solution: Usually points y x page 6 Solution: Parabola Higher Degree Polynomial Equations (cubic, quartic, etc.) x + 5x + 6x 0 page 5 Solution: Usually x points, where x is the highest exponent y x + 5x + 6x Solution: Curve Rational Equations x x page 0 y + x + x + Solution: Usually simplifies to a Solution: Usually simplifies to a linear or quadratic equation linear or quadratic equation * To determine the equation type, simplify the equation. Occasionally all variables cancel out. If the resulting equation is true (e.g. 5 5), then all real numbers are solutions. If the resulting equation is false (e.g. 5 4), then there are no solutions. Number Lines & Interval Notation... Linear Inequalities with Variable... The Cartesian Plane... Graphing Lines... Line Basics... 4 Finding the Equation of a Line... 5 Systems of Linear Equations... 6 Solving Systems of Linear Equations... 7 Solving Word Problems... 8 Polynomial Definitions... 9 Polynomial Operations... 9 Factor Out the GCF... 0 Factor 4 Term Expressions... Factor Trinomials: Leading Coefficient of. Find It Fast Factor Any Trinomial... Easy to Factor Polynomial Types... Factor Any Polynomial... Quadratic Methods... 4 Solve Any Variable Equation... 5 Graph Quadratic Equations in Variables... 6 Exponents & Powers... 7 Scientific Notation... 7 Roots... 8 Rational Expressions... 9 Solving Rational Equations... 0 Formulas... Dictionary of Terms...
2 MA094 Part - Beginning Algebra Summary Page of 8/8/0 Number Lines Number Lines & Interval Notation ( ) If the point is not included [ ] If the point is included Shade areas where infinite points are included Interval Notation (shortcut, instead of drawing a st graph the answers on a number line, then write the interval notation by following your shading from left to right Always written: ) Left enclosure symbol, ) smallest number, ) comma, 4) largest number, 5) right enclosure symbol Enclosure symbols number line) ( ) Does not include the point [ ] Includes the point Infinity can never be reached, so the enclosure symbol which surrounds it is an open parenthesis Ex. x " x is equal to " Ex. x " x is not equal to " Ex. x < " x is less than " Ex. x " x is less than or equal to ".. Ex. x " x is greater than " Ex. x " x is greater than or equal to " Linear Inequalities with Variable { } (,) (,] (, ) [, ) Standard Form ax + b < c ax + b c ax + b c ax + b c x Solution A ray x 0 Multiplication When both sides of an inequality are multiplied or 4 x Property of divided by a negative number, the direction of the 4 x Inequality inequality symbol must be reversed to form an equivalent inequality. Solving. Same as Solving an Equation with Variable Ex 4 x (MA090), except when both sides are multiplied or 4 x divided by a negative number x x. Checking Plug solution(s) into the original equation. Should get a true inequality. Plug a number which is not a solution into the original equation. Shouldn t get a true inequality 4 ( ) (0)
3 MA094 Part - Beginning Algebra Summary Page of 8/8/0 Rectangular Coordinate System The Cartesian Plane Two number lines intersecting at the point 0 on each number line. X-AXIS - The horizontal number line Y-AXIS - The vertical number line ORIGIN - The point of intersection of the axes QUADRANTS - Four areas which the rectangular coordinate system is divided into ORDERED PAIR - A way of representing every point in the rectangular coordinate system (x,y) Quadrant II Quadrant I Is an Ordered Pair a Solution? Yes, if the equation is a true statement when the variables are replaced by the values of the ordered pair Quadrant III Quadrant IV Ex x + y 7 (, ) is a solution because + () 7 General Graphing by plotting random points Graphing linear equations by using a point and a slope Graphing Lines Lines which intersect the x-axis contain the variable x Lines which intersect the y-axis contain the variable y Lines which intersect both axis contain x and y. Solve equation for y. Pick three easy x-values & compute the corresponding y-values. Plot ordered pairs & draw a line through them. (If they don t line up, you made a mistake). Plot the point. Starting at the plotted point, vertically move the rise of the slope and horizontally move the run of the slope. Plot the resulting point. Connect both points x + y 7 x 7 y + x y y x + Point 7/ Slope /
4 MA094 Part - Beginning Algebra Summary Page 4 of 8/8/0 x-intercept (x, 0) y-intercept (0, y) Slope of a Line Properties of Slope Standard Form Slope-Intercept Form Point-Slope Form Line Basics WHERE THE GRAPH CROSSES THE X-AXIS Ex x + y 7 Let y 0 and solve for x x + (0) 7 x 7 (7,0) WHERE THE GRAPH CROSSES THE Y-AXIS Ex x + y 7 Let x 0 and solve for y 0 + y 7 y.5 (0,. 5) x The slant of the line. y x y Ex Let P (, ), P ( 4, 4) Let Point : P ( x, y) & Point : P ( x, y) 4 rise (change in y) m y y m (slope) x x 4 run (change in x) y y x x POSITIVE SLOPE - Line goes up (from left to right). The greater the number, the steeper m 0 the slope NEGATIVE SLOPE - Line goes down (from left m / to right). The smaller the number (more m undefined negative), the steeper the slope. HORIZONTAL LINE - Slope is 0 m VERTICAL LINE - Slope is undefined m m / PARALLEL LINES - Same slope m PERPENDICULAR LINES - The slope of one is the negative reciprocal of the other Ex: m ½ is perpendicular to m ax + by c x + y 7 x and y are on the same side The equations contains no fractions and a is positive y mx + b, where m is the slope of the line, By solving x + y 7 for y & b is the y-intercept x 7 y + y equals form ; easy to graph form y y m(x x ), where m is the slope of the line & (x, y ) is a point on the line Using (7, 0) and m Simplified, it can give you Standard Form or Slope-Intercept Form y 0 ( x 7)
5 MA094 Part - Beginning Algebra Summary Page 5 of 8/8/0 If you have a horizontal line Finding the Equation of a Line The slope is zero y b, where b is the y-intercept Ex. y If you have a vertical line The slope is undefined x c, where c is the x-intercept Ex. x - If you have a slope & y-intercept Plug directly into Slope-Intercept Form Ex. m 4 & y-intercept ( 0, ) y 4x + 4( 0) + If you have a point & a slope If you have a point & a line that it is parallel or perpendicular to METHOD. Use Point-Slope Form. Work equation into Standard Form or Slope-Intercept Form METHOD. Plug the point into the Slope- Intercept Form and solve for b. Use values for m and b in the Slope- Intercept Form. Determine the slope of the parallel or perpendicular line (e.g.. if it is parallel, it has the same slope). If the slope is undefined or 0, draw a picture. If the slope is a non-zero real number, go to If you have a point & a slope Ex. point (,) & m y ( x ) y x 6 y x 4 ( ) ( ) 4 Ex. point (,) & m y mx + b ( ) ( )( ) + b 6 + b b 4 y x 4 ( ) ( ) 4 Ex. point (,) & perpendicular to x-axis m undefined x Ex. point (,) & perpendicular to y x 4 m, so for perpendicular line m - / If you have points. Use the slope equation to determine the slope. Go to If you have a point & a slope Ex. ( 0, 0 ) & (, 6) 6 0 m 0
6 MA094 Part - Beginning Algebra Summary Page 6 of 8/8/0 Type of Intersection Systems of Linear Equations IDENTICAL (I) - Same slope & same y-intercept NO SOLUTION (N) - Same slope & different y- intercept, the lines are parallel ONE POINT - Different slopes y x Solve y x y x Identical Consistent Dependent Terminology Solving by Graphing CONSISTENT SYSTEM - The lines intersect at a point or are identical. System has at least solution INCONSISTENT SYSTEM - The lines are parallel. System has no solution DEPENDENT EQUATIONS - The lines are identical. Infinite solutions INDEPENDENT EQUATIONS - The lines are different. One solution or no solutions. Graph both equations on the same Cartesian plane. See Graphing Lines p.. The intersection of the graphs gives the common solution(s). If the graphs intersect at a point, the solution is an ordered pair.. Check the solution in both original equations y x Solve y x + No solution Inconsistent Independent x y Solve x y y x y x One point Consistent Independent
7 MA094 Part - Beginning Algebra Summary Page 7 of 8/8/0 Solving by Substitution Solving by Addition or Subtraction of Equations Solving Systems of Linear Equations. Solve either equation for either variable. (pick the equation with the easiest variable to solve for). Substitute the answer from step into the other equation. Solve the equation resulting from step to find the value of one variable * 4. Substitute the value form Step in any equation containing both variables to find the value of the other variable. 5. Write the answer as an ordered pair 6. Check the solution in both original equations. Rewrite each equation in standard form Ax + By C. If necessary, multiply one or both equations by a number so that the coefficients of one of the variables are opposites.. Add equations (One variable will be eliminated)* 4. Solve the equation resulting from step to find the value of one variable. 5. Substitute the value form Step 4 in any equation containing both variables to find the value of the other variable. 6. Write the answer as an ordered pair 7. Check the solution in both original equations x y Solve x 4 6y x. y x. x 4 6. x + x + 4 x 4. ( ) y 5. (, ) 6. ( ) ( ) ( ) 4 6( ) 6 6 x y Solve x 4 6y. x y x 6y 4.Multiply both sides of the first equation by x + 4 y x 6y 4. y 4. y 5. x ( ) x 6. (, ) 7. ( ) + 4( ) ( ) 4 6( ) 6 6 *If all variables disappear & you end up with a true statement (e.g. 5 5), then the lines are identical If all variables disappear & you end up with a false statement (e.g. 5 4), then the lines are parallel
8 MA094 Part - Beginning Algebra Summary Page 8 of 8/8/0 UNDERSTAND THE PROBLEM As you use information, cross it out or underline it. DEFINE VARIABLES Create Let statement(s) The variables are usually what the problem is asking you to solve for WRITE THE EQUATION(S) You need as many equations as you have variables 4 SOLVE THE EQUATION(S) 5 ANSWER THE QUESTION Answer must include units! 6CHECK Plug answers into equation(s) Solving Word Problems Variable, Equation Variables, Equations Method Method In a recent election for mayor 800 people voted. Mr. Smith received three times as many votes as Mr. Jones. How many votes did each candidate receive? Name what x is (Can only be one thing. When in doubt, choose the smaller thing) Define everything else in terms of x Let x Number of votes Mr. J x Number of votes Mr. S x + x 800 4x 800 x 00 Go back to your Let statement 00 Number of votes Mr. J 600 Number of votes Mr. S (00) + (00) Let x Number of votes Mr. S y Number of votes Mr. J Usually each sentence is an equation x + y 800 x y ( y) + y 800 (Substitution) 4 y 800 y 00 Go back to your Let statement 00 Number of votes Mr. J Go back to your Equations & solve for remaining variable x + (00) 800 x Number of votes Mr. S (600) + (00) (600) (00)
9 MA094 Part - Beginning Algebra Summary Page 9 of 8/8/0 Polynomial Definitions Polynomial A SUM OF TERMS WHICH CONTAINS ONLY WHOLE NUMBER EXPONENTS AND NO VARIABLE IN THE DENOMINATOR. Refers to an expression; can have polynomial equations Degree of a Polynomial Express polynomial in simplified form. Sum the powers of each variable in the terms. The degree of a polynomial is the highest degree of any of its terms Names for polynomials according to terms Names for polynomials according to degree Determines number of x-intercepts MONOMIAL- term BINOMIAL- terms TRINOMIAL- terms LINEAR degree ( st power of a variable) QUADRATIC degree CUBIC degree QUARTIC degree 4 x + x + x 5 y 4x y & 4y 5 + y 6 are both 6th-degree x; (x + ) x + x + x + x x x x 4 Multiplication (Multiply each term of the first polynomial by each term of the second polynomial, and then combine like terms) Division Horizontal Method Can be used for any size polynomials Vertical Method Can be used for any size polynomials. Similar to multiplying two numbers together FOIL Method May only be used when multiplying two binomials. First terms, Outer terms, Inner terms, Last terms Dividing a Polynomial by a Monomial a + b + c a b c + + d d d d Polynomial Operations Ex: ( x )( x + 5x ) x( x + 5x ) ( x + 5x ) x x + x 5 x + x( ) + ( ) x + ( ) 5 x + ( ) ( ) x + 5x x x 0x + x + x x + Ex: ( x )( x + 5x ) x 5x 5 x x x x x 0x x + x x + Ex: ( x )( x ) F O I L x x + x( ) + ( ) x + ( ) ( ) x x x + 6 x 5x + 6 x + x x Ex: Ex: factor & canel x + ( x + ) x + x + 4 4
10 MA094 Part - Beginning Algebra Summary Page 0 of 8/8/0 Factoring GCF (Greatest Common Factor) of a List of Integers GCF of a List of Variables GCF of a List of Terms Factor by taking out the GCF Factor Out the GCF Writing an expression as a product Numbers can be written as a product of primes. Polynomials can be written as a product of prime polynomials Useful to simplify rational expressions and to solve equations The opposite of multiplying. Write each number as a product of prime numbers. Identify the common prime factors. The PRODUCT OF ALL COMMON PRIME FACTORS found in Step is the GCF. If there are no common prime factors, the GCF is The variables raised to the smallest power in the list The product of the GCF of the numerical coefficients and the GCF of the variable factors. Find the GCF of all terms. Write the polynomial as a product by factoring out the GCF. Apply the distributive property 4. Check by multiplying Factored ( x + ) Not factored x + 4 x + factoring x + 4 ( x + ) multiplying Find the GCF of 8 & GCF 6 Find the GCF of x & x GCF x Find the GCF of 8x& 0x GCF 6x + g( x) x + 6x ( x ) g ( x ) x ( x) x + 6x x + ( ) g( x ) + ( ) g( ) ( x ) x +
11 MA094 Part - Beginning Algebra Summary Page of 8/8/0 Factor 4 Term Expressions a + b + c + d (? +?)(? +?) FACTOR BY GROUPING. Arrange terms so the st terms have a common factor and the last have a common factor. For each pair of terms, factor out the pair s GCF. If there is now a common binomial factor, factor it out 4. If there is no common binomial factor, begin again, rearranging the terms differently. If no rearrangement leads to a common binomial factor, the polynomial cannot be factored. Factor 0ax 6xy 9y+5a. 0ax + 5a 6xy 9y. 5a(x + ) y(x + ) (x + )(5a y) TRIAL & ERROR Factor Trinomials: Leading Coefficient of x + bx + c (x +?)(x +?) Product is c (x + one number)(x + other number) Sum is b. Place x as the first term in each binomial, then determine whether addition or subtraction should follow the variable x + bx + c ( x + d)( x + e) x bx + c ( x d)( x e) x ± bx c ( x + d)( x e). Find all possible pairs of integers whose product is c. For each pair, test whether the sum is b 4. Check with FOIL Ex: Factor x. ( x + )( x + ) 4. x + 7. g 5 0 g x YES NO ( x + 5)( x + ) x + 0
12 MA094 Part - Beginning Algebra Summary Page of 8/8/0 Factor Any Trinomial ax + bx + c (?x +?)(?x +?) METHOD (trial & error). Try various combinations of factors of ax and c until a middle term of bx is obtained when checking. Ex: Factor: Product is x x Product is -5 (x )( x + 5) + 4x 5. Check with FOIL METHOD (ac, factor by grouping). Identify a, b, and c. Find magic numbers whose product is ac and whose sum is b. Factor trees can be very useful if you are having trouble finding the magic numbers (See MA090). Rewrite bx, using the magic numbers found in Step 4. Factor by grouping 5. Check with FOIL METHOD (quadratic formula). Use the quadratic formula to find the x values (or roots) 5x x 4x (correct middle term) Ex: Factor: x + 4x 5. a b 4 c 5. ac () g( 5) 5 b 4 (5) g( ) 5 (5) + ( ) 4 magic numbers 5,. x + 5x x 5 4. x(x + 5) (x + 5) (x + 5)(x ) Ex: Factor: x + 4x 5. a b 4 c 5 4 ± 4 4( )( 5) x 6 x, 5. For each answer in step., rewrite the equation so that it is equal to zero. x x 0 x 0. Multiply the two expressions from step, and that is the expression in factored form. 4. Check with FOIL x 5 x ( x )( x + 5)
13 MA094 Part - Beginning Algebra Summary Page of 8/8/0 Perfect Square Trinomials a ± ab + b Difference of Squares a b Sum of Squares a + b Difference of Cubes a b (MA0) Sum of Cubes a + b (MA0) Prime Polynomials (P) Easy to Factor Polynomial Types Factors into perfect squares (a binomial squared) a + ab + b ( a + b) a ab + b ( a b) Factors into the sum & difference of two terms a b ( a + b)( a b) Does not factor a + b Prime a b ( a b)( a + ab + b ) a + b ( a + b)( a ab + b ) 9x + 4x + 6 ( x) + ( x)(4) + (4) (x + 4) ( a x, b 4) 9x 4x + 6 ( x) ( x)(4) + (4) (x 4) ( a x, b 4) x ( x) () x + ( x + )( x ) is prime (x )(4x 6 ( a x, b ) 8x 7 ( x) ( ) ( a x, b ) ( ) ( (x + )(4x 6 x + 9) x + x + ) a x b Can not be factored x + x + is prime x is prime (, ) x + 9) Factor Any Polynomial. Are the variable terms in descending order of degree with the 4 Ex. + x constant term last? If not, put them in descending order. 4 x. Are there any common factors? If so, see Factor Out the 4 ( x 6) GCF (p.0). How many terms? ( x + 4)( x 4) TERMS see if one of the following can be applied Difference of Squares (p.) Sum of Cubes (p.) Difference of Cubes (p.) TERMS try one of the following Perfect Square Trinomial (p.) Factor Trinomials: Leading Coefficient of (p.) Factoring Any Trinomial (p.) 4 TERMS try Factor by Grouping (p.) 4. If both steps & produced no results, the polynomial is prime. You re done Skip steps 5 & 6 5. See if any factors can be factored further ( x + 4)( x + )( x ) 6. Check by multiplying ( x + 4) [ ( x + )( x ) ] ( x + 8)( x 4) 4 x
14 MA094 Part - Beginning Algebra Summary Page 4 of 8/8/0 Quadratic Methods Standard Form ax + bx + c 0 x x + 0 Solutions Has n solutions, where n is the x x + x 0 (has solutions) highest exponent Zero Factor. If a product is 0, then a factor is 0 xy 0 (either x or y must be zero) Property Solve by Factoring Solve with the Quadratic Equation. Write the equation in standard form (equal 0). Factor. Set each factor containing a variable equal to zero 4. Solve the resulting equations To solve a quadratic equation that is difficult or impossible to factor Steps. Write the values for a, b, & c ( if a term does not exist, the coefficient is 0). Plug values into the quadratic equation below: b ± b 4ac x a. Simplify solutions and usually leave them in their most exact form ( Negative radicand means no real solutions) x x + 0. x(x ) (x ) 0. x 0, x 0, x 0. x 0,, Ex Radicand is a perfect square x x + 0 a, b ( ), c ( ± ± x (), Ex Radicand breaks into perfect square and leftovers x + 6x 0 a, b 6, c ( ) ) ( ) 4()() (6) ± (6) 4()( ) x () 6 ± 40 6 ± ± ± 0 Ex Radicand is just leftovers 4x x 0 a 4, b ( ), c ( ) x ( ) ± ( ) 4(4)( ) 7 ± 8 (4)
15 MA094 Part - Beginning Algebra Summary Page 5 of 8/8/0 Solve Any Variable Equation Is it really an equation? No It s an expression, you can t solve it. You can factor, expand & simplify it Yes Make an equivalent, simpler equation If the equation contains fractions, eliminate the fractions (multiplying both sides by the LCD) If there is a common factor in each term, divide both sides of the equation by the common factor Can the variable be isolated? Yes Solve by undoing the equation Linear equations can by undone with the addition, subtraction, multiplication & division equality properties MA090 Quadratics, of the form (x + a) b, can be undone with the square root property MA0/0 No Write the equation in standard form Make one side equal to zero Put variable terms in descending order of degree with the constant term last Can it easily be put in factored form? Yes Solve by Factoring p. 4 No Is it a quadratic equation? Yes Solve with the Quadratic Equation p. 4 -or- Solve by Completing the Square MA0/0 No Not covered in this class Check solutions in the original equation
16 MA094 Part - Beginning Algebra Summary Page 6 of 8/8/0 Standard Form Solution Simple Form y ax Graph Graph Quadratic Equations in Variables y ax + bx + c a, b, and c are real constants A parabola Vertex (high/low point) is (0,0) Line of symmetry is x 0 The parabola opens up if a 0, down if a < 0. Plot y value at vertex. Plot y value one unit to the left of the vertex. Plot y value one unit to the right of the vertex y x 9x + 0 y 4x y 4x x y
17 MA094 Part - Beginning Algebra Summary Page 7 of 8/8/0 Exponential notation Shorthand for repeated multiplication Multiplying common bases Add powers Dividing common bases Subtract powers Raising a product to a power Raise each factor to the power Raising a quotient to a power Raise the dividend and divisor to the power Exponents & Powers base x a exponent 8 a b a b x g x x + m x m n x n x ( xy) x gy a a a ( x y ) x gy m n a ma na n x x y y Raising a power to a power a ( ) Multiply powers Raising to the zero power One Raising to a negative power Reciprocal of positive power When simplifying, eliminate negative powers x x n n b a x x b 0 n + 5 g ( x )( y)( 4x) 4x ( ) x 9 x 4x 6 4 z g ( ), when x 0 n x z z () x (6) 6 g g y Scientific Notation Standard Form Standard Form to Scientific Notation Scientific Notation to Standard Form Scientific Notation Shorthand for writing very small and large numbers a 0 r, where a<0 & r is an integer Long way of writing numbers Move the decimal point in the original number to the left or right so that there is one digit before the decimal point. Count the number of decimal places the decimal point is moved in step If the original number is 0 or greater, the count is positive If the original number is less than, the count is negative. Multiply the new number is step by 0 raised to an exponent equal to the count found in step (. 0 ) (. 0 ) Multiply numbers together
18 MA094 Part - Beginning Algebra Summary Page 8 of 8/8/0 Roots Computation Roots Undoes raising to powers 8 9 because 9 8 index 8 radical radicand If n IS AN EVEN POSITIVE INTEGER, then n n a a The radical represents only the non-negative square root of a. The represents the negative square root of a. IF n IS AN ODD POSTIVIE INTEGER, then n n a a (The square root of 8 is 9) 7 7 (The cube root of 7 is ) 9 ( ) + 9 ( x ) x + 9 "Not a real number".09.. (...09).7.7 (approximately) 7 7 ( ) Notation: Radical vs. Rational Exponent Operations The root of a number can be expressed with a radical or a rational exponent Rational exponents The numerator indicates the power to which the base is raised. The denominator indicates the index of the radical Roots are powers with fractional exponents, thus power rules apply. 7 (7) ( ) ( ) / / ( 7 ) 7 7 Note, it s usually easier to compute the root before the power 8 x ( 8 x ) / / / / / ( 8) ( x ) Product Rule n n n a b ab Quotient Rule n a a n n,provided b 0 n b b Simplifying. Separate radicand into perfect Just perfect squares... Expressions squares and leftovers 6x 6x. Compute perfect squares Prefect squares & leftovers.... Leftovers stay inside the radical so the answer will be exact, not rounded x 6x x 4x x Just leftovers... x x x
19 MA094 Part - Beginning Algebra Summary Page 9 of 8/8/0 Rational Numbers Irrational Numbers Rational Expression Simplifying Rational Expressions (factor) Multiplying/ Dividing Rational Expressions (multiply across) Adding/ Subtracting Rational Expressions (get common denominator) Rational Expressions Can be expressed as quotient of integers (fraction) where the denominator 0 All integers are rational All terminating decimals are rational Cannot be expressed as a quotient of integers. Is a non-terminating decimal. An expression that can be written in the form P, where P and Q are polynomials Q. Denominator 0. Completely factor the numerator and denominator. Cancel factors which appear in both the numerator and denominator. If it s a division problem, change it to a multiplication problem. Factor & simplify. Multiply numerators and multiply denominators 4. Write the product in simplest form. Factor & simplify each term. Find the LCD The LCD is the product of all unique factors, each raised to a power equal to the greatest number of times that it appears in any one factored denominator. Rewrite each rational expression as an equivalent expression whose denominator is the LCD 4. Add or subtract numerators and place the sum or difference over the common denominator 0 0/ 4 4/ 4.5 7/4 π x, Find real numbers for x + 6 which this expression is undefined: x + 6 0; x 6 4x + 0 Simplify x 5 4( x + 5) ( x + 5) ( x 5) 4 x 5 x x Simplify g x + 6 x x ( x + 6) x + 6 x Simplify + x LCD 6( x + 6)?? + 6( x + 6) 6( x + 6) (6) x ( x + 6) + (6)( x + 6) 6( x + 6) 6x x ( x + 6) 6( x + 6) 9x + 8 6( x + 6) 5. Write the result in simplest form 9 ( x + ) 6 ( x + 6) x + 6 ( x + 6)
20 MA094 Part - Beginning Algebra Summary Page 0 of 8/8/0 Solving by Eliminating the Denominator Solving Proportions with the Cross Product a c b d Solving Rational Equations. Factor & simplify each term. Multiply both sides (all terms) by the LCD. Remove any grouping symbols 4. Solve 5. Check answer in original equation. If it makes any of the denominators equal to 0 (undefined), it is not a solution If your rational equation is a proportion, it s easier to use this shortcut. Set the product of the diagonals equal to each other. Solve. Check x Solve + x + 6 x LCD x( x + 6) x x + 6 x x( x + 6) x x( x + 6) + x 6 + x x( x) + ( x + 6) ( x + 6 x) x + x + 8 x + 6x x 6 (6) Check + (6) + 6 (6) + x Solve 4 x [ x( x + 6) ] + [ x( x + 6) ] ( x ) 4x x 4x x ( ) Check 4 ( ) [ x( x + 6) ]
21 MA094 Part - Beginning Algebra Summary Page of 8/8/0 Geometric Triangle Formulas SUM OF ANGLES: Angle + Angle + Angle 80 o Right Triangle PYTHAGOREAN THEOREM: a + b c c (a leg, b leg, c hypotenuse) b ~The hypotenuse is the side opposite the right angle. It is a always the longest side. Other Distance DISTANCE: d rt (r rate, t time) Real Numbers Positive Infinity (Infinity) Negative Infinity Dictionary of Terms Points on a number line Whole numbers, integers, rational and irrational numbers An unimaginably large positive number. (If you keep going to the right on a number line, you will never get there) An unimaginably small negative number. (If you keep going to the left on a number line, you will never get there) 7 7, 7,, π or +
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