Answer:
f^-1(x) = (x+8)/4
Explanation:
To find the inverse function,
FIRST, change f(x) to y.
f(x)=4x-8
y = 4x - 8
SECOND, switch the x and the y.
x = 4y - 8
NEXT, solve for y.
x = 4y - 8
add 8 to both sides.
x + 8 = 4y
divide both sides by 4.
(x+8)/4 = y
LAST, rewrite using f^-1(x) in place of y
f^-1(x) = (x+8)/4
If you have better functionality (than me typing on my phone) use a -1 exponent beside the f. Also, put the x+8 on top of the fraction with the 4 on the bottom of the fraction. Then you won't need the parenthesis around the x+8