Answer
$16x^2-25$
Work Step by Step
$(4x+5)(4x-5)=(4x)(4x)+(4x)(-5)+(5)(4x)+(5)(-5)=16x^2-20x+20x-25=16x^2-25$
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 - Review Exercises - Page 143: 77
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