Answer
{-3, 5}
Work Step by Step
1. Factor the expression.
$x^{2}$ - 2x - 15 = (x - 5)(x + 3)
2. Apply the zero factor property.
a) x -5 = 0
b) x + 3 = 0
3. Solve each equation.
a) x = 5
b) x = -3
The solutions are {-3, 5}.
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 5 - Section 5.8 - Solving Equations by Factoring and Problem Solving - Exercise Set - Page 323: 33
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