143. Tentukan invers dari 𝑓(𝑥) = 8𝑥 + 4 !
a. 𝑓−1(𝑥) = 𝑥 + 4
b. 𝑓−1(𝑥) = (𝑥 − 4) / 8
c. 𝑓−1(𝑥) = 𝑥 − 4
d. 𝑓−1(𝑥) = (𝑥 − 8) / 4
e. 𝑓−1(𝑥) = (−𝑥 − 4) / 8
Jawaban :
𝑓(𝑥) = 8𝑥 + 4
y = 8x + 4
y - 4 = 8x
x = (y - 4) / 8
𝑓−1(y) = (y - 4) / 8
𝑓−1(x) = (x - 4) / 8
Jawaban : B
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