Answer
$p=7$ 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 $p=-3$
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
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
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