Exponents. Reteach. Write each expression in exponential form (0.4)
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1 9-1 Exponents You can write a number in exponential form to show repeated multiplication. A number written in exponential form has a base and an exponent. The exponent tells you how many times a number, the base, is used as a factor. 8 4 exponent base Write the expression in exponential form. (0.7) (0.7) (0.7) (0.7) 0.7 is used as a factor 4 times. (0.7) (0.7) (0.7) (0.7) (0.7) 4 Write each expression in exponential form (0.4) You can find the value of expressions in exponential form. Find the value. 5 6 Step 1 Write the expression as repeated multiplication Step 2 Multiply , ,625 Simplify (1.2)
2 9-3 Order of Operations A mathematical phrase that includes only numbers and operations is called a numerical expression is a numerical expression. When you evaluate a numerical expression, you find its value. You can use the order of operations to evaluate a numerical expression. Order of operations: 1. Do all operations within parentheses. 2. Find the values of numbers with exponents. 3. Multiply and divide in order from left to right. 4. Add and subtract in order from left to right. Evaluate the expression. 60 (7 3) Do all operations within parentheses. Find the values of numbers with exponents. Multiply and divide in order from left to right. Add and subtract in order from left to right. Simplify each numerical expression (12 8) (12 34) (6 5) (10 4) (8 5) (2 8) (12 4) (3 3 10) 2 Solve. 10. Write and evaluate your own numerical expression. Use parentheses, exponents, and at least two operations. 231
3 10-2 Evaluating Expressions A variable is a letter that represents a number that can change in an expression. When you evaluate an algebraic expression, you substitute the value given for the variable in the expression. Algebraic expression: x 3 The value of the expression depends on the value of the variable x. If x If x If x Evaluate 4n 5 for n 7. Replace the variable n with 7. 4(7) 5 Evaluate, following the order of operations. 4(7) Evaluate each expression for the given value. Show your work. 1. a 7 when a 3 2. y 3 when y 6 a y n 5 when n (6 d) 2 when d 3 n 5 5 (6 d) 2 (6 ) n 2 when n b when b 7 2 3n 2 3( ) f when f m when m k 5 when k (p 3) when p 7 232
4 10-3 Generating Equivalent Expressions Look at the following expressions: x 1x x x 2x x x x 3x The numbers 1, 2, and 3 are called coefficients of x. Identify each coefficient. 1. 8x 2. 3m 3. y 4. 14t An algebraic expression has terms that are separated by and. In the expression 2x 5y, the terms are 2x and 5y. Expression 8x 4y Terms 8x and 4y 5m 2m 9 5m, 2m, and 9 4a 2 2b c 2a 2 4a 2, 2b, c, and 2a 2 Sometimes the terms of an expression can be combined. Only like terms can be combined. 2x 2y NOT like terms, the variables are different. 4a 2 2a NOT like terms, the exponents are different. 5m 2m Like terms, the variables and exponents are both the same. n 3 2n 3 Like terms, the variables and exponents are both the same. To simplify an expression, combine like terms by adding or subtracting the coefficients of the variable. 5m 2m 3m 4a 2 5a a 3 4a 2 6a 3 Note that the coefficient of a is 1. Simplify. 5. 8x 2x 6. 3m m 7. 6y 6y 8. 14t 3t 9. 3b b a 3a n 5n 3c d 2d e 233
5 11-1 Writing Equations to Represent Situations An equation is a mathematical sentence that says that two quantities are equal. Some equations contain variables. A solution for an equation is a value for a variable that makes the statement true. You can write related facts using addition and subtraction You can write related facts using multiplication and division You can use related facts to find solutions for equations. If the related fact matches the value for the variable, then that value is a solution. A. x 5 9; x 3 B. x 7 5; x 12 Think: 9 5 x Think: 5 7 x 4 x 12 x is not a solution of x is a solution of x 7 5. x C. 2x 14; x 9 D. 3 ; x 15 5 Think: 14 2 x Think: 3 5 x 7 x 15 x is not a solution of 2x is a solution of x 5 3. Use related facts to determine whether the given value is a solution for each equation. s 1. x 6 14; x ; s g 3 7; g a 18; a y 9; y b 5 20; b 3 v ; v p 6; p k 78; k
6 11-2 Addition and Subtraction Equations To solve an equation, you need to get the variable alone on one side of the equal sign. You can use tiles to help you solve subtraction equations. 1 1 Variable add 1 subtract 1 Addition undoes subtraction, so you can use addition to solve subtraction equations. One positive tile and one negative tile make a zero pair. Zero pair: 1 ( 1) 0 add 1 subtract make zero To solve x 4 2, first use tiles to model the equation. X 4 2 To get the variable alone, you have to add positive tiles. Remember to add the same number of positive tiles to each side of the equation. x Then remove the greatest possible number of zero pairs from each side of the equal sign. x 6 The remaining tiles represent the solution. x 6 Use tiles to solve each equation. 1. x x x 1 4 x x x 4. x x x 6 2 x x x 235
7 11-3 Multiplication and Division Equations Number lines can be used to solve multiplication and division equations. Solve: 3n 15 How many moves of 3 does it take to get to 15? n 5 Check: Solve: n 3 4 If you make 3 moves of 4, where are you on the number line? n 12 Check: Show the moves you can use to solve each equation. Then give the solution to the equation and check your work. 1. 3n 9 Solution: n Show your check: 2. 2 n 4 Solution: n Show your check: 236
8 11-4 Writing Inequalities An equation is a statement that says two quantities are equal. An inequality is a statement that says two quantities are not equal. A solution of an inequality that contains a variable is any value or values of the variable that makes the inequality true. All values that make the inequality true can be shown on a graph. Inequality Meaning Solution of Inequality x 3 x 3 x 3 All numbers greater than 3 All numbers greater than or equal to 3 All numbers less than 3 The open circle at 3 shows that the value 3 is not included in the solution. The closed circle at 3 shows that the value 3 is included in the solution. x 3 All numbers less than or equal to 3 Graph the solutions of each inequality. 1. x 4 Draw an open circle at 4. Read x > 4 as x is greater than 4. Draw an arrow to the right of a 1 2. x 1 Draw a closed circle at 1. Read x 1 as x is less than or equal to 1. Draw an arrow to the left of y 3 Write an inequality that represents each phrase. 5. the sum of 2 and 3 is less than y 6. the sum of y and 2 is greater than or equal to 6 237
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