tentukan nilai dari f(4) jika g(x)= 3x-5 dan gof(x)=(2x-3)²

(gof)(x) = (2x-3)(2x-3)
g(f(x)) = 4x²-6x-6x+9
g(f(x)) = 4x²-12x+9
3f(x) - 5 = 4x²-12x+9
3f(x) = 4x²-12x+14
f(x) = (4x²-12x+14)/3

f(4) = (4(4)²-12(4)+14)/3
f(4) = (64-48+14)/3
f(4) = 10