Answer
$$x=9$$ $$x=-7$$
Work Step by Step
Let $x$ be the number.
Thus,
$$x^2-2x=63$$
Subtract $63$ from both sides:
$$x^2-2x-63=63-63$$
$$x^2-2x-63=0$$
Factor:
$$(x-9)(x+7)=0$$
$$x-9=0 \: or \: x+7=0$$
$$x=9$$ $$x=-7$$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 6 - Section 6.7 - Quadratic Equations and Problem Solving - Practice - Page 461: 2
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