Answer
(x-5)(x+4)
Work Step by Step
In the trinomial x$^2$-x-20, b=-1 and c=-20.
The set of factors of c whose sum is equal to b are -5 and 4.
Therefore the factorization is:
(x-5)(x+4)
Introductory Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-805-X
ISBN 13:
978-0-13417-805-9
Chapter 6 - Review Exercises - Page 479: 11
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