Answer
$81x^4-256$
Work Step by Step
Use the formula $(A+B)(A-B)=A^2-B^2$ to evaluate the product as
$(3x+4)(3x-4)(9x^2+16)=(9x^2-16)(9x^2+16)=81x^4-256$
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter P - Section P.4 - Polynomials - Exercise Set - Page 56: 88
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