Answer
$16x^4-25y^2$
Work Step by Step
$(4x^2-5y)(4x^2+5y)=16x^4+20x^2y-20yx^2-25y^2=16x^4-25y^2$
Or use the formula $(a+b)(a-b)=a^2-b^2$ to get the same result.
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter R - Review of Basic Concepts - R.3 Polynomials - R.3 Exercises - Page 33: 71
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