Question

Use inverse operations to write the inverse of the function.
f(x) = x + 3
f^-1(x) = ?

Answer 1

1. Replace f(x) with y
2. Swap x and y
3. Isolate y
4. Replace y with f^-1(x)

Answer 2

y = x + 3
x = y + 3
x - 3 = y

or
y = x - 3
f^-1(x) = x - 3

Answer 3

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

Answer 4

@hero? How would I do that one?