Answer
$-2x^2-x+20$
Work Step by Step
$(x^2+7x+9)+(x^2+4)-(4x^2+8x-7)$
$=x^2+7x+9+x^2+4-4x^2-8x+7$
$=x^2+x^2-4x^2+7x-8x+9+4+7$
$=-2x^2-x+20$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 5 - Review - Page 406: 80
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