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= 12x^2 - 12x - 144 (bagi 12 semuanya)
= x^2 - x - 12
(x-4) , (x+3)
x=4 , x=-3
uji (0,0)
= 12.0^2 - 12.0 - 144
= -144
turun pada interval
-3<x<4
F'(x)=3x^2-14x+8>0
(3x-2)(x-4)>0
Jadi, X>4 atau x <2/3