## Elementary Algebra

Published by Cengage Learning

# Chapter 5 - Exponents and Polynomials - 5.1 - Addition and Subtraction of Polynomials - Problem Set 5.1: 20

#### Answer

$-3a+3$

#### Work Step by Step

We write an expression to express this addition problem: $3a^2+4a-7+(-3a^2-7a+10)$ We use the commutative and associative properties of addition to group like terms: $(3a^2+(-3a^2))+(4a+(-7a))+(-7+10)$ We combine the like terms: $0-3a+3=-3a+3$

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