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g(x)=x+1
f(x)=?
jadi f(g(x))= 2(x+1)kuadrat+4(x+1) = 2xkuadrat+8x+5
f(x+ 1) = 2x^2 + 4x
y + 1 = x
y = x - 1
f(x) = 2(x-1)^2 + 4(x-1)
= 2(x^2 - 2x + 1) + 4(x - 1)
= 2x^2 - 4x + 2 + 4x - 4
= 2x^2 - 2
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