Answer
(x+9)(3x-4)
Work Step by Step
You are given $3x^{2}$+23x-36. Factor it out:
$3x^{2}$+27x-4x-36 -break out the middle value-
($3x^{2}$+27x)+(-4x-36) -group the first two and last two terms-
3x(x+9)-4(x+9) -Find the GCF of each grouping-
(3x-4)(x+9) -factor out the common term-
=(3x-4)(x+9)