Precalculus (6th Edition)

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

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.
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