Answer:
36...? After doing all of the incorrect math.. I got 36. Sry if it's wrong.
Step-by-step explanation:
I suck at math. :/
All of them are equivalent expressions, except for the fourth one
8x-12
f(-3) = 6
input -3 in f(x)
so f(-3) = -3(-3) - 3
multiple and add
7x^2y(2x-3y)
Factor 7x^2y out of 14x^3y-21x^2y^2