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
(
1
,
−
3
)
{\left(1 , -3 \right)}
(
1
,
−
3
)
(
−
3
,
1
)
{\left(-3 , 1 \right)}
(
−
3
,
1
)
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
↦
5
x
−
8
for
x
∈
R
,
x
≥
1.
{f: x \mapsto 5 x - 8} \allowbreak \quad \allowbreak {\textrm{for } x \in \mathbb{R}, x \geq 1.}
f
:
x
↦
5
x
−
8
for
x
∈
R
,
x
≥
1.
f
−
1
:
x
↦
1
5
x
+
8
5
for
x
∈
R
,
x
≥
−
3.
{f^{-1}: x \mapsto \frac{1}{5} x + \frac{8}{5}} \allowbreak \quad \allowbreak {\textrm{for } x \in \mathbb{R}, x \geq -3.}
f
−
1
:
x
↦
5
1
x
+
5
8
for
x
∈
R
,
x
≥
−
3.
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