Answer
$15x^{2}+12x-9$
Work Step by Step
We are given that $P(x)=3x+3$ and $R(x)=5x^{2}-7$.
$3[R(x)]+4[P(x)]=3(5x^{2}-7)+4(3x+3)=(15x^{2}-21)+(12x+12)$
Combine like terms.
$15x^{2}+12x+(-21+12)=15x^{2}+12x-9$
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 5 - Section 5.3 - Polynomials and Polynomial Functions - Exercise Set - Page 281: 117
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