Answer
We must substitute.
Work Step by Step
We used substitution initially. Thus, our answer is not correct yet, for we have not substituted the original values back into the original expression yet.
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 5 - Section 5.6 - Factoring Trinomials - Vocabulary, Readiness & Video Check - Page 303: 9
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