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f(3x-1) = 9x²-6x-3,
(3x-1)² -4 = 9x²-6x+1-4
= 9x²-6x-3
f-¹(12) = x²-4
= (12)²-4
= 144-4
= 140
coba test lagi ya!
g(x)=3x -1
F(g(x))=F(3x-1)=9x^2 -6x -3
= (3x-1)(3x+3)
Misalkan 3x-1=x
Maka F(x)=x(3x+3)
F^-1(x)=(3x-3)/x
F^-1(12)=(36-3)/12