For the function f(x) = (8-2x)2 ,find f-1 . determine whether f-1 is a function.

a.
f-1(x) = ; f-1 is a function

b.
f -1 (x) = ; f-1 is not a function

c.
f-1(x) = ; f-1 is not a function

d.
f-1(x) = ; f-1 is a function

f(x) = (8-2x)2=y
let 's find the inverse is  
 (8-2x)2=y,  (8-2x)=sqrt(y), and -2x=sqrt(y) -8,  finally x= (-1/2)sqrt(y)+4
the inverse is f^-1(y)=(-1/2) √y  + 4, when x=y

the inverse is f^-1(x)=(-1/2) √x  + 4

A:  f-1(x) = ;f-1 is a function