Question

Tuliskan fungsi invers dari f(x)=5x+8 ??????????????????????????????????????????

Answer 1

f(x) = 5x + 8. 
Misal: f(x) = y;

y = 5x + 8
5x =y – 8
x = 1/5 (y – 8)

y = f(y) = 1/5 (y – 8)
f-1(x) = 1/5 (x – 8)

Answer 2

F(x)=5x+8
y=5x+8
y-8=5x
x=1/5(y-8)
fungsi invers=1/5(x-8)