18. Diketahui fungsi 𝑓(𝑥) = 𝑥 / (𝑥+1) dan 𝑔(𝑥)=√𝑥. Nilai dari (𝑓 + 𝑔)(9) = ...
a. 29/10
b. 30/10
c. 31/10
d. 32/10
e. 39/10
Jawaban :
𝑓(𝑥) = 𝑥 / (𝑥+1)
𝑔(𝑥)=√𝑥
(𝑓 + 𝑔)(9) = f (9) + g (9)
kita hitung f(9) dan g(9) terlebih dahulu ~
𝑓(𝑥) = 𝑥 / (𝑥+1)
f (9) = 9 / (9 + 1)
f (9) = 9 / 10
𝑔(𝑥)=√𝑥
g (9) = √9
g (9) = 3
(𝑓 + 𝑔)(9) = f (9) + g (9)
(𝑓 + 𝑔)(9) = 9/10 + 3
(𝑓 + 𝑔)(9) = 9/10 + 30/10
(𝑓 + 𝑔)(9) = 39/10
Jawaban : E
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