Question

Tolong ya. nomor 21. terima kasih

Answer 1

F(x)=y
y=(2x+1)/(3-x)  ,x tidak = 3
(3-x)y= 2x+1
3y-xy =2x +1
-xy=2x+1-3y
-2x-xy=1-3y
x(-2-y)= 1-3y
x= (1-3y)/(-2-y) 

maka f(x)^-1= (1-3y)/(-2-y)
f(3)^-1 = (1+9)/(-2+3)
           = 10