Answer
$(9x-4)(x+1)$
Work Step by Step
$9x^{2}+5x-4=$
two factors of $ac=-36$ whose sum is $b=+5$ are $+9$ and $-4.$
Rewrite the middle term and factor in pairs.
$9x^{2}+5x-4=9x^{2}+9x-4x-4$
$=9x(x+1)-4(x+1)$
$=(9x-4)(x+1)$
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter P - Section P.5 - Factoring Polynomials - Exercise Set - Page 68: 32
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