Answer
$16x^4-25x^2$
Work Step by Step
$$(4x^2+5x)(4x^2-5x)$$ $$=(4x^2\times 4x^2)+(4x^2\times (-5x))+(5x\times 4x^2)+(5x\times (-5x))$$ $$=16x^4-20x^3+20x^3-25x^2$$ $$=16x^4-25x^2$$
College Algebra (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-32178-228-3
ISBN 13:
978-0-32178-228-1
Chapter P - Prerequisites: Fundamental Concepts of Algebra - Exercise Set P.4 - Page 61: 37
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