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: 66

Answer

$81y^4-450y^2+625$

Work Step by Step

Use the formula $(a+b)(a-b)=a^2-b^2$, we have $(3y-5)(3y+5)(9y^2-25)=(9y^2-25)(9y^2-25)=(9y^2-25)^2=81y^4-450y^2+625$
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