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
(
2
,
4
)
{\left(2 , 4 \right)}
(
2
,
4
)
(
5
,
−
2
)
{\left(5 , -2 \right)}
(
5
,
−
2
)
(
4
,
2
)
{\left(4 , 2 \right)}
(
4
,
2
)
(
−
2
,
5
)
{\left(-2 , 5 \right)}
(
−
2
,
5
)
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
↦
−
2
x
+
8
for
x
∈
R
,
2
<
x
<
5.
{f: x \mapsto - 2 x + 8} \allowbreak \quad \allowbreak {\textrm{for } x \in \mathbb{R}, 2 < x < 5.}
f
:
x
↦
−
2
x
+
8
for
x
∈
R
,
2
<
x
<
5.
f
−
1
:
x
↦
−
1
2
x
+
4
for
x
∈
R
,
−
2
<
x
<
4.
{f^{-1}: x \mapsto - \frac{1}{2} x + 4} \allowbreak \quad \allowbreak {\textrm{for } x \in \mathbb{R}, -2<x<4 .}
f
−
1
:
x
↦
−
2
1
x
+
4
for
x
∈
R
,
−
2
<
x
<
4.
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