145. Diketahui 𝑓(𝑥) = 2𝑥 − 5 dan g(𝑥) = 𝑥^2 + 4 , tentukan (𝑓 ∘ 𝑔)(𝑥)!
a. 𝑥^2 + 3
b. 𝑥^2 − 3
c. 3𝑥^2 + 2
d. 2𝑥^2 − 2
e. 2𝑥^2 + 3
Jawaban :
𝑓(𝑥) = 2𝑥 − 5
g(𝑥) = 𝑥^2 + 4
(𝑓 ∘ 𝑔)(𝑥)
= f (g (x))
= f ( 𝑥^2 + 4 )
= 2 (𝑥^2 + 4) - 5
= 2x^2 + 8 - 5
= 2x^2 + 3
(𝑓 ∘ 𝑔)(𝑥) = 2x^2 + 3
Jawaban : E
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