Kisi Kisi PAT Matematika Kelas XI no 146

146. Diketahui 𝑓(𝑥) = 2𝑥 − 5 dan g(𝑥) = 𝑥^2 + 4 , tentukan (𝑔 ∘ 𝑓)(3) !

a. 10

b. 15

c. 5

d. 1

e. 0

Jawaban :

𝑓(𝑥) = 2𝑥 − 5

g(𝑥) = 𝑥^2 + 4 

f(3) = 2(3) - 5

f(3) = 6 - 5

f(3) = 1

(𝑔 ∘ 𝑓)(3)

= g(f (3))

= g (1)

= (1)^2 + 4

= 1 + 4

= 5

(𝑔 ∘ 𝑓)(3) = 5

Jawaban : C