What is the f inverse of x?

Question

If f(x) = (1 - x ) / 2 , what is f ^-1 (x)?

Answer 1

f(x) = (1-x)/2

y = (1-x)/2

To find the inverse, switch the x and y around.

x = (1-y)/2

Solve for y.

2x = 1 - y

y = -2x + 1

f^-1(x) = -2x + 1