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Let’s check out your problem:
4
4
4
. If
g
(
x
)
=
f
−
1
(
x
)
g(x)=f^{-1}(x)
g
(
x
)
=
f
−
1
(
x
)
, and
f
(
x
)
=
x
−
4
f(x)=\sqrt{x-4}
f
(
x
)
=
x
−
4
then solve for
g
′
(
1
)
g^{\prime}(1)
g
′
(
1
)
.
View step-by-step help
Home
Math Problems
Algebra 2
Find the vertex of the transformed function
Full solution
Q.
4
4
4
. If
g
(
x
)
=
f
−
1
(
x
)
g(x)=f^{-1}(x)
g
(
x
)
=
f
−
1
(
x
)
, and
f
(
x
)
=
x
−
4
f(x)=\sqrt{x-4}
f
(
x
)
=
x
−
4
then solve for
g
′
(
1
)
g^{\prime}(1)
g
′
(
1
)
.
Understand Relationship:
Understand the relationship between
f
(
x
)
f(x)
f
(
x
)
and
g
(
x
)
g(x)
g
(
x
)
.
f
(
x
)
=
x
−
4
f(x) = \sqrt{x-4}
f
(
x
)
=
x
−
4
and
g
(
x
)
=
f
−
1
(
x
)
g(x) = f^{-1}(x)
g
(
x
)
=
f
−
1
(
x
)
, meaning
g
(
f
(
x
)
)
=
x
g(f(x)) = x
g
(
f
(
x
))
=
x
.
Find Derivative of
f
(
x
)
f(x)
f
(
x
)
:
Find the derivative of
f
(
x
)
f(x)
f
(
x
)
.
f
′
(
x
)
=
(
1
2
)
(
x
−
4
)
−
1
2
⋅
1
=
1
2
x
−
4
.
f'(x) = \left(\frac{1}{2}\right)\left(x-4\right)^{-\frac{1}{2}} \cdot 1 = \frac{1}{2\sqrt{x-4}}.
f
′
(
x
)
=
(
2
1
)
(
x
−
4
)
−
2
1
⋅
1
=
2
x
−
4
1
.
Apply Inverse Function Formula:
Apply the formula for the derivative of the inverse function.
g
′
(
x
)
=
1
f
′
(
g
(
x
)
)
.
g'(x) = \frac{1}{f'(g(x))}.
g
′
(
x
)
=
f
′
(
g
(
x
))
1
.
Substitute
x
=
1
x = 1
x
=
1
:
Substitute
x
=
1
x = 1
x
=
1
into
g
′
(
x
)
g'(x)
g
′
(
x
)
.
\newline
g
′
(
1
)
=
1
f
′
(
g
(
1
)
)
g'(1) = \frac{1}{f'(g(1))}
g
′
(
1
)
=
f
′
(
g
(
1
))
1
.
Find
g
(
1
)
g(1)
g
(
1
)
:
Find
g
(
1
)
g(1)
g
(
1
)
using the fact that
g
(
f
(
x
)
)
=
x
g(f(x)) = x
g
(
f
(
x
))
=
x
.
\newline
Since
f
(
g
(
1
)
)
=
1
f(g(1)) = 1
f
(
g
(
1
))
=
1
,
g
(
1
)
−
4
=
1
\sqrt{g(1)-4} = 1
g
(
1
)
−
4
=
1
.
\newline
g
(
1
)
−
4
=
1
2
g(1) - 4 = 1^2
g
(
1
)
−
4
=
1
2
.
\newline
g
(
1
)
=
5
g(1) = 5
g
(
1
)
=
5
.
Substitute
g
(
1
)
g(1)
g
(
1
)
into
f
′
(
g
(
1
)
)
f'(g(1))
f
′
(
g
(
1
))
:
Substitute
g
(
1
)
g(1)
g
(
1
)
into
f
′
(
g
(
1
)
)
f'(g(1))
f
′
(
g
(
1
))
.
\newline
f
′
(
5
)
=
1
2
5
−
4
=
1
2
f'(5) = \frac{1}{2\sqrt{5-4}} = \frac{1}{2}
f
′
(
5
)
=
2
5
−
4
1
=
2
1
.
Calculate
g
′
(
1
)
g'(1)
g
′
(
1
)
:
Calculate
g
′
(
1
)
g'(1)
g
′
(
1
)
.
\newline
g
′
(
1
)
=
1
(
1
2
)
=
2
g'(1) = \frac{1}{(\frac{1}{2})} = 2
g
′
(
1
)
=
(
2
1
)
1
=
2
.
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