Algebra 1: Common Core (15th Edition)

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

Chapter 11 - Rational Expressions and Functions - Get Ready! - Page 661: 16


$d=7$ or $d=-3$

Work Step by Step

$5d^2-20d=105$ $5d^2-20d-105=0$ $5d^2+15d-35d-105=0$ $5d(d+3)-35(d+3)=0$ $(5d-35)(d+3)=0$ $5(d-7)(d+3)=0$ $d-7=0$ or $d+3=0$ $d=7$ or $d=-3$
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