Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 6 - Section 6.6 - Solving Quadratic Equations by Factoring - Exercise Set: 20

Answer

The solutions are 7 and -9.

Work Step by Step

$x^{2}$+2x-63=0 $x^{2}$+9x-7x-63=0 x(x+9)-7(x+9)=0 (x-7)(x+9)=0 x-7=0 or x+9=0 x-7+7=0+4 or x+9-9=0-9 x=7 or x=-9 The solutions are 7 and -9. Check Let x=7 $x^{2}$+2x-63=0 $7^{2}$ +2*7-63=0 49+14-63=0 63-63=0 0=0 Let x= -9 $x^{2}$+2x-63=0 $(-9)^{2}$ +2(-9)-63=0 81-18-63=0 0=0
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