Math Interactive
2. Functions
2.2. Inverse functions
2.2.4. Relationship
Important
The graphs of
f
f
f
and
f
−
1
f^{-1}
f
−
1
are symmetrical about the line
y
=
x
.
y=x.
y
=
x
.
Examples
x
{x}
x
y
{y}
y
(
3
,
8
)
{\left(3 , 8 \right)}
(
3
,
8
)
(
8
,
3
)
{\left(8 , 3 \right)}
(
8
,
3
)
y
=
f
(
x
)
{y=f(x)}
y
=
f
(
x
)
y
=
f
−
1
(
x
)
{y=f^{-1}(x)}
y
=
f
−
1
(
x
)
y
=
x
{y=x}
y
=
x
Get new example
f
:
x
↦
4
x
−
4
for
x
∈
R
,
x
≥
3.
{f: x \mapsto 4 x - 4} \allowbreak \quad \allowbreak {\textrm{for } x \in \mathbb{R}, x \geq 3.}
f
:
x
↦
4
x
−
4
for
x
∈
R
,
x
≥
3.
f
−
1
:
x
↦
1
4
x
+
1
for
x
∈
R
,
x
≥
8.
{f^{-1}: x \mapsto \frac{1}{4} x + 1} \allowbreak \quad \allowbreak {\textrm{for } x \in \mathbb{R}, x \geq 8.}
f
−
1
:
x
↦
4
1
x
+
1
for
x
∈
R
,
x
≥
8.
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