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substitusi x=-1
f(-1)=2(3(-1)+2)^3
f(-1)=2(-3+2)^3
f(-1)=2(-1)^3
f(-1)=2(-1)
f(-1)=-2
f ' (x) = 2(3) (3x+2)² (3)
= 18(3x+2)²
f ' (-1) = 18(-3+2)²
= 18(-1)²
= 18
kalo
f(-1) = 2(3(-1)+2)³
= 2(-1)³
= -2