Precalculus
Functions and Graphs
Inverse Functions
Interactive Example 1
Given:
f(x) = ax+b.
Find: formula for
f
-1
(x)
.
a =
b =
1.
y
=
Write
y
instead of
f(x)
.
2.
x
=
Interchange
x
and
y.
3.
=
x
Solve the equation
x = f(y)
for
y.
=
4.
f
-1
(x)
=
Write
f
-1
(x)
instead of
y.
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