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= 2(x³+1)- 6x -6
= 2x³ + 2 - 6x-6
= 2x³-6x-4
x=a-1
f(a) = 2(a-1)^3 - 6(a-1)
= .... dilanjutin sendriri yaaa... :D
akhirnya f(a) diganti dengan f(x+1) dan semua bilangan a di ruas kanan diganti x