Question

Jika f : R ⇒R dan g : R ⇒R dengan f(x) = x³ dan g(x) = 2x+1, maka f(g(2)) = ........

Answer 1

Diketahui f(x) = x³ dan g(x) = 2x + 1.
Carilah nilai g(2) dahulu, maka:
=> g(x) = 2x + 1
=> g(2) = 2(2) + 1
=> g(2) = 5
Substitusi nilai g(2) = 5 kedalam x pada f(x), maka:
=> f(x) = x³
=> f(g(2)) = x³
=> f(5) = (5)³ = 125

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