Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 3 - Section 3.4 - Real Zeros of Polynomials - 3.4 Exercises - Page 284: 83

Answer

$\pm\frac{1}{2},\pm\sqrt 5$

Work Step by Step

Let $y=x^2$, we have $P(x)=4y^2-21y+5=(4y-1)(y-5)$ The zeros are $y=1/4, 5$ so $x^2=1/4,5$ We have zeros for P as $\pm\frac{1}{2},\pm\sqrt 5$
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