Answer
$7.3x^{2}-4.2x-5.3$
Work Step by Step
$(4.5x^{2}+8.1x)+(2.8x^{2}-12.3x-5.3)$
$=4.5x^{2}+8.1x+2.8x^{2}-12.3x-5.3$
$=4.5x^{2}+2.8x^{2}+8.1x-12.3x-5.3$
$=7.3x^{2}-4.2x-5.3$
Prealgebra (7th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321955048
ISBN 13:
978-0-32195-504-3
Chapter 10 - Section 10.2 - Integrated Review - Operations on Polynomials - Page 712: 7
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