diketahui f(x)=2x-3 . jika g(x)=2x (kuadrad)+3x-4,maka (f . g)(x)=
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= f(2x²+3x-4)
= 2(2x²+3x-4) -3
= 4x² + 6x - 8 - 3
= 4x² + 6x - 11
Maka hasilanya ialah (fog)(x) = 4x² + 6x - 11