Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 9 - Quadratic Functions and Equations - 9-4 Factoring to Solve Quadratic Equations - Practice and Problem-Solving Exercises - Page 571: 21


$p=7$ or $p=-3$

Work Step by Step

$p^2-4p=21$ $p^2-4m-21=0$ $(p-7)(p+3)=0$ $p-7=0$ or $p+3=0$ $p=7$ or $p=-3$
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