MAC 1140: Test 1 Review, Fall 2017 Exam covers Lectures 1 5, Sections A.1 A.5. II. distance between a and b on the number line is d(a, b) = b a
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1 MAC 1140: Test 1 Review, Fall 2017 Exam covers Lectures 1 5, Sections A.1 A.5 Important to Remember: If a and b are real numbers, I. Absolute Value: { a a < 0 a = a a 0 Note that: 1) a 0 2) a = a ) a = a b b for b 0, 4) ab = a b II. distance between a and b on the number line is d(a, = b a III. n x n = x if n is even, n xn = x if x is odd, ( n x) n = x if the root is defined III. Special Products and Factoring If u and v are numbers, variables or expressions: 1) (u + v) 2 = u 2 + 2uv + v 2 and (u v) 2 = u 2 2uv + v 2 2) u 2 v 2 = (u v)(u + v) ) u v = (u v)(u 2 + uv + v 2 ) and u + v = (u + v)(u 2 uv + v 2 ) Exercises: 1. Find: ( 4) c) ( 4) /2 d) ( 8) 1/ e) ( 125) 2/ f) ( 4) 2 { 0 2. If A = 4, 25, π 4, 0., 27, 2, 9, 0, }, Classify the subsets of A which are ( Integers ( Rational numbers (c) Irrational numbers (d) Real numbers
2 . Express the following both in interval notation and as an inequality. Be sure to simplify. x is less than 2 but no less than x is at most 5 units from 4. Write without absolute value bars and simplify: π 5 π 12 4r + r 1 if r > c) 2x + x2 1 x If x = 1 and y = evaluate: 2x y (2x)2 x + y x y x 1 + y 2 x 4 y 6. Rewrite as a piecewise expression without absolute value bars: 2x + 5 2x Evaluate: 56 (0.24) 52 (0.86) (0.24) 477 (0.86) ( 8. Evaluate: 9 27 ) 2/ ( ) 1/ ( 2) Simplify the expression: ( ) 2a 2 (abc) 1 b 1 2 ( ) 27( xy 2 ) 16x 10 1/4 ( 6x /2 y 1 c) d) c x 2 y 4 x 6 8x 1/2 y Simplify each radical expression. Be sure to use absolute value as necessary (hint: consider the possible domain of each variable). a 4 b 11 c 6 4 8a 8 6v a 4 b 8 c 5 c) d) b 14 24v 11. Simplify each radical expression and rationalize the denominator: 81a 2 b 4 4x 10 y 12 5 z 5 64x 5 z y Rationalize the denominator of each expression: 1 x 2 xy 10 8 c) x 2 x y Simplify each expression if possible: 80x + 125x 2 + x 180x a 2 + b Perform the operation: (2x + ) (m + n)(m n) ) 2
3 15. Factor completely: 4x ( 2x) 2 8x 2 ( 2x)(x 1) x 4 x 2 12 c) 20 y y 2 d) 1 2 x + 2x 2 6x (factor so there are no fractional coefficients) e) 4x 4 x 2 16x + 4x f) 2x 5 4x 2 g) 5x 2 26x + 5 h) (2x 1) 2 9y 6 i) 9x xy + 16y 2 j) Factor using grouping only: 6x 2 x Factor the expression with negative exponents: remember to factor out the least power of the common variable/expression 15x 2 (2x + 1) 5 10x 1 (2x + 1) Find the domain of the expression and reduce to its lowest terms: 2x2 x 2 + x x 2 x 4 12y2 4y 5 6y 2 y Perform the operation and simplify. Find all excluded values of the variable. Note: In the factoring formula a ± b = (a ± (a 2 ab + b 2 ) the trinomial will not factor (if a and b do not have a common factor). 4x 2 4 x 2 x + 1 x 4 + x x 2 + 2x + 1 6x2 1x + 6 x 2 2x 8x 27 4x + 6x 2 + 9x 19. Perform the operations and simplify: 4 2x + 1 x x + 2 2x x x + 1 x + x c) x + 1 x 1 ( ) 1 x + 1 x Simplify each compound fraction. Find the domain of each fraction. x 2 (x + 1) 2 x (x + 1) 1 4 x + 4 x x + 6 x Simplify completely: x 2 y 2 x y x x2 + 4 x x Simplify the difference quotient: 1 x + h 1 x h x + h + 1 x + 1 (rationalize the numerator) h
4 2. Solve each equation: x (2x + ) = 9 5x 2x + 4 = Solve each equation. Indicate all excluded values of the variable. x 8 2x = 1 2 x 2 6x x 4 = 2 x 2 c) 4y + 12y 2 y = Solve the equation by completing the square, and check by solving using factoring: x 2 2x = Solve by completing the square: 9x 2 + = 18x 27. Use the discriminant to determine the nature of the roots of each of the following quadratic equations: x(x 2) = 2 2x 2 x + 6 = 0 c) 4x = 12x 28. Solve each equation if possible using the quadratic formula: x(x 2) = 2 2x 2 x+6 = 0 c) 4x 2 +9 = 12x d) 29. Solve each equation and check your answers: 2x = 0 x = 15 2x c) 2x + x + 2 = 2 0. Solve for x and check your solutions: (x + 6) /2 = 8 (x 2) 2/ = 9 1. Solve the absolute value equations: 2x + 2 = 9 x 2 + 6x = x + 18 c) 2x + = x 2. Solve the following equations by factoring or substitution: x x = 4x 4x 4 12x = 0 c) (x 2 1) 2 + (x 2 1) 12 = 0 d) 6x 2 + x 1 = 2. Find all excluded values of the variable and solve by factoring: 2(x + 1) 1/ x 4/ (x + 1) 2/ x 2/ = 0 (Hint: write without negative exponents after factoring) x x x = 4
5 MAC 1140 Exam 1 Review Fall 2017 This review, produced by the CLAS Teaching Center, contains a collection of questions which are representative of the type you may encounter on the exam. Other resources made available by the Teaching Center include: Walk-In tutoring at Broward Hall Private-Appointment, one-on-one tutoring at Broward Hall Walk-In tutoring in LIT 215 Supplemental Instruction Video resources for Math and Science classes at UF Written exam reviews and copies of previous exams The teaching center is located in the basement of Broward Hall: You can learn more about the services offered by the teaching center by visiting
6 MAC 1140 Exam 1 Review 1. Sketch the following subsets of the real numbers on a number line ( [ 4, 12) ( (, 0] (c) x 5 (d) x is no larger than Sketch the following subsets of the real numbers on a number line ( x < 2 ( x 2 (c) x 1 > (d) The distance from x to 1 is at least 2.. Simplify the radical expressions 18z5 x ( 7 2zx ( (c) 5 64x 10 2x Write each function piecewise without absolute value bars. ( e(x) = x ( f(x) = 2x + 1 (c) h(x) = 1 x 5. Expand each of the following expressions. ( (x + 1) 2 ( (x 2)(x + 2) (c) (2x 1) (d) (x + y + 1)(x + y 1) CLAS Teaching Center 2
7 MAC 1140 Exam 1 Review 6. Determine the requested coefficient in the expanded form of each expression below. ( Coefficient of x 2 in (2x 4)(1 x) ( Coefficient of x in (2x + 1) 2 (c) Coefficient of x in (2x + ) (d) Coefficient of xy in (x + y 1)(2x y + 2) 7. Factor each of the following polynomials. ( 8y 2 (x + ) 2(x + ) ( x 4 4 (c) x 2 + x 6 (d) x 2 6x + (e) 2x 2 + 5x (f) x 27 (g) x + x 2 6x Simplify each expression, leaving positive exponents only. ( x 4/ + 2x 1/ ( x 1 (1 + x 2 ) 2/ 2x (1 + x 2 ) 1/ (c) x 2 (1 2x) /2 + (1 2x) 1/2 (d) 2(x2 ) (2x)(x + 1) (x + 1) 2 (x 2 ) 2 [(x + 1) ] 2 9. Solve the following equations for the indicated variable. ( y = x + 2 for x. x 1 ( 4x 2 1 = 7 for x (c) 2t = t for t (d) x 2 = 1 for x (e) x + 1 9x = 5 for x (f) 10x + 5x + 6 = 1 2 for x (g) (x 2 x 22) /2 = 27 for x CLAS Teaching Center
8 MAC 1140 Review for Exam 1, Fall 2017 This is an exam review provided by the Teaching Center s Math Study Center, located in S.E. Broward basement. The Teaching Center provides walk-in tutoring as well as individual, weekly appointment tutoring services for a variety of subjects. The service is 100% free! This review was made with input from your instructor. 1) 2) ) 4) Each set of numbers on the left can be described as being an example of a kind of number on the right. Match each set on the left the kind of the number that best describes its members on the right. 9 { 2, π, π} Real {1,2,} Whole {77, 24, 5} Natural {,4,0} Irrational {0,1,2} Integer Write without absolute value bars and simplify: π 7 4 π 10π 2 5π 16 Find the products: (2x + y 1)(2x y 1) (2x + y)(2x y)(4x 2 + 9y 2 ) Factor completely. Leave the expression rationalized and with only positive exponents: 7(x 2 + 2) 2 (1 x 2 ) 2 + (x 2 + 2)(1 x 2 ) x 1 (1 + x 2 ) 2 2x (1 + x 2 ) 1 5) Simplify the rational expressions. x 8 x 2 4 x + 2x 2 + 4x x 2 + x 2 (x + 1) 2 (2x) x 2 (2)(x + 1) (x + 1) 4 6) ( x2 y 4z 1) (8x 2 yz ) 16x2 y 6 z 10 y 5 z 2 c) d) 64 20a 7 bc 6 7) 8) 9) Simplify: Solve and check the solutions: 2 x + 1 2x + = 1 Solve for y in y y + 1 = 1 y 2 y
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