Diketahui f(x)=2x+1 dan g(x)=xkuadrat-2, rumus untuk (gof)(x)=
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g(x) = x²-2
(gof)(x) = g(f(x))
= (2x+1)²-2
= 4x²+4x+1-2
= 4x²+4x-1
= g(2x + 1)
= (2x + 1)² - 2
= 4x² + 4x + 1 - 2
= 4x² + 4x - 1