## Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson

# Chapter 4 - Polynomials - Mid-Chapter Review - Mixed Review - Page 263: 19

#### Answer

$3a^4-13a^3-13a^2-4$

#### Work Step by Step

By combining like terms, the given expression, $(3a^4-9a^3-7)-(4a^3+13a^2-3)$, simplifies to \begin{array}{l}\require{cancel} 3a^4-9a^3-7-4a^3-13a^2+3 \\\\= 3a^4+(-9a^3-4a^3)-13a^2+(-7+3) \\\\= 3a^4-13a^3-13a^2-4 .\end{array}

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