#### 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)

Published by
Pearson

ISBN 10:
0-13417-805-X

ISBN 13:
978-0-13417-805-9

(x-5)(x+4)

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