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REFLECT

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**1a. Write the expression 3n – 4n – 8 as a sum**

1a. Write the expression 3n – 4n – 8 as a sum. How does this help you identify the terms of the expression? Identify the terms. 3m + (-4n) + (-8) Writing an expression as a sum clarifies the parts being added and their signs. 3m, -4n, -8

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**1b. Explain and illustrate the difference between a term and a coefficient.**

A term is a part of an expression being added. A coefficient is a numerical factor of a term. Ex. 4x is a term of 4x + 1. Its coefficient is 4.

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**1c. What is the coefficient of x in the expression x - 2**

1c. What is the coefficient of x in the expression x - 2? Explain your reasoning. 1 x = 1∙x so the numerical factor of the term is 1.

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**1d. What is the value of 1-18+25 if you subtract then add**

1d. What is the value of if you subtract then add? If you add then subtract? Why is the order of operations necessary? Subtract and then add 8 Add then subtract -42 Results will vary if a consistent order is NOT followed.

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VOCABULARY evaluate An algebraic expression – substitute the value(s) of the variable(s) into the expression and simplify using the order of operations

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REFLECT - Part 2 2a. Explain why x and 4x - 10 are factors of the expression x(4x - 10)3 rather than terms of the expressions. What are the terms of the factors 4x – 10. The expressions x and 4x – 10 are multiplied, not added, to form x(4x-10)3, which makes them factors, not terms 4x, -10

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**2b. Evaluate 5a + 3b and (5 + a)(3 + b) for a = 2 and b = 4**

2b. Evaluate 5a + 3b and (5 + a)(3 + b) for a = 2 and b = 4. How is the order of the steps different for the two expressions? 5a + 3b 22 Multiply first then add (5 + a)(3 + b) 49 Add first then multiply

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**Subtract, then multiply, then add -7**

2c. In what order would you perform the operations to correctly evaluate the expression 2 + (3 – 4)∙9? What is the result. Subtract, then multiply, then add -7

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2d. Show how to move the parentheses in the expression 2 + (3 – 4)∙9 so that the value of the expression is 9. ( – 4) ∙ 9

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