(a) f′(x)=6x2−6x−12=6(x2−x−2)=6(x−2)(x+1)f'(x) = 6x^2 - 6x - 12 = 6(x^2 - x - 2) = 6(x-2)(x+1)f′(x)=6x2−6x−12=6(x2−x−2)=6(x−2)(x+1) Kritieke punten: x=−1x = -1x=−1; x=2x = 2x=2 (b)
(c)