Question

PLS HELP!

If f(x)= x+3/4 what is the equation for f–1(x)?

A) f–1(x) = 4(x + 3)


B) f–1(x) = 4x - 3


C) f–1(x) = 4(x - 3)


D) f–1(x) = 4x + 3

Answer 1

f^-1(x) = 4x-3

Explanation:

f(x) = (x+3)/4

y = (x+3)/4

Exchange x and y

x = (y+3)/4

Solve for y

4x = y+3

Subtract 3

4x-3 = y

The inverse

f^-1(x) = 4x-3