turunan fungsi, mohon bantuannya

f(x)=(3x²-2)³
u= 3x²-2
u'=6x
f'(x)=n.u'(u)³-¹
=3(6x)(3x²-2)²
=(18x)(3x²-2)²
f'(2)=(18(2))(3(2)²-2)²
=(32)(3(4)-2)²
=(32)(12-2)²
=(32)(10)²
=(32)(100)=3200