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f(x) = x + 4
g(x) = x^2 + 3x + 7
Ditanya : (g o f) (x) ....?
Dijawab :
untuk mencari (g o f) (x), f(x) disubtitusi ke g(x) sehingga:
(g o f) (x) = x^2 + 3x + 7
(g o f) (x) = (x + 4)^2 + 3(x + 4) + 7
(g o f) (x) = x^2 + 8x + 16 + 3x + 12 + 7
(g o f) (x) = x^2 + 11 x + 35