Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

Published by Pearson
ISBN 10: 0-32193-104-1
ISBN 13: 978-0-32193-104-7

Appendix A - Review - A.3 Polynomials - A.3 Assess Your Understanding - Page A31: 30


$-x^3+4x^2 -4x-9$

Work Step by Step

We simplify by removing the parentheses and then combine the like terms as follows $$ (x^2 - 3x - 4) - (x^3 - 3x^2 + x + 5)=x^2 - 3x - 4- x^3 +3x^2 - x -5\\ =-x^3+4x^2 -4x-9 .$$
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