Answer
$9(x-5)(x+1)$
Work Step by Step
First, factor out the greatest common factor, which is $9$.
$9x^{2}-36x-45=9(x^{2}-4x-5)$
Then, use FOIL to factor the trinomial.
$9(x^{2}-4x-5)=9(x-5)(x+1)$
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305115546
ISBN 13:
978-1-30511-554-5
Chapter P, Prerequisites - Section P.6 - Factoring - P.6 Exercises - Page 43: 71
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