104. Diketahui f (𝑥) = 𝑥^2 + 2 , dan 𝑔(𝑥) = −2𝑥 + 4. Tentukan nilai dari (𝑓 ∘ 𝑔)(−1) adalah …
a. 40
b. 38
c. 36
d. 34
e. 32
Jawaban :
f (𝑥) = 𝑥^2 + 2
𝑔(𝑥) = −2𝑥 + 4
(𝑓 ∘ 𝑔)(x) = f (g (x))
(𝑓 ∘ 𝑔)(x) = f (- 2x + 4)
(𝑓 ∘ 𝑔)(x) = (- 2x + 4)^2 + 2
(𝑓 ∘ 𝑔)(x) = 4x^2 - 16x + 16 + 2
(𝑓 ∘ 𝑔)(x) = 4x^2 - 16x + 18
(𝑓 ∘ 𝑔)(−1) = 4(-1)^2 - 16(-1) + 18
(𝑓 ∘ 𝑔)(−1) = 4(1) + 16 + 18
(𝑓 ∘ 𝑔)(−1) = 4 + 34
(𝑓 ∘ 𝑔)(−1) = 38
Jawaban : B
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