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Let’s check out your problem:
For the function
f
(
x
)
=
x
7
−
8
5
f(x)=\sqrt[5]{x^{7}-8}
f
(
x
)
=
5
x
7
−
8
, find
f
−
1
(
x
)
f^{-1}(x)
f
−
1
(
x
)
.
\newline
f
−
1
(
x
)
=
(
x
7
)
5
+
8
f^{-1}(x)=(\sqrt[7]{x})^{5}+8
f
−
1
(
x
)
=
(
7
x
)
5
+
8
\newline
f
−
1
(
x
)
=
x
5
+
8
7
f^{-1}(x)=\sqrt[7]{x^{5}+8}
f
−
1
(
x
)
=
7
x
5
+
8
\newline
f
−
1
(
x
)
=
(
x
+
8
)
5
7
f^{-1}(x)=\sqrt[7]{(x+8)^{5}}
f
−
1
(
x
)
=
7
(
x
+
8
)
5
\newline
f
−
1
(
x
)
=
x
5
7
+
8
f^{-1}(x)=\sqrt[7]{x^{5}}+8
f
−
1
(
x
)
=
7
x
5
+
8
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Math Problems
Calculus
Find derivatives of using multiple formulae
Full solution
Q.
For the function
f
(
x
)
=
x
7
−
8
5
f(x)=\sqrt[5]{x^{7}-8}
f
(
x
)
=
5
x
7
−
8
, find
f
−
1
(
x
)
f^{-1}(x)
f
−
1
(
x
)
.
\newline
f
−
1
(
x
)
=
(
x
7
)
5
+
8
f^{-1}(x)=(\sqrt[7]{x})^{5}+8
f
−
1
(
x
)
=
(
7
x
)
5
+
8
\newline
f
−
1
(
x
)
=
x
5
+
8
7
f^{-1}(x)=\sqrt[7]{x^{5}+8}
f
−
1
(
x
)
=
7
x
5
+
8
\newline
f
−
1
(
x
)
=
(
x
+
8
)
5
7
f^{-1}(x)=\sqrt[7]{(x+8)^{5}}
f
−
1
(
x
)
=
7
(
x
+
8
)
5
\newline
f
−
1
(
x
)
=
x
5
7
+
8
f^{-1}(x)=\sqrt[7]{x^{5}}+8
f
−
1
(
x
)
=
7
x
5
+
8
Write function as
y
y
y
:
To find the inverse function, we first write the function as
y
=
x
7
−
8
5
y = \sqrt[5]{x^7 - 8}
y
=
5
x
7
−
8
.
Express function in terms:
Next, we express the function in terms of
x
x
x
:
x
=
y
7
−
8
5
x = \sqrt[5]{y^7 - 8}
x
=
5
y
7
−
8
.
Eliminate fifth root:
Now we raise both sides of the equation to the power of
5
5
5
to eliminate the fifth root:
x
5
=
y
7
−
8
x^5 = y^7 - 8
x
5
=
y
7
−
8
.
Isolate term with y:
We then add
8
8
8
to both sides to isolate the term with
y
y
y
:
x
5
+
8
=
y
7
x^5 + 8 = y^7
x
5
+
8
=
y
7
.
Solve for
y
y
y
:
Next, we take the seventh root of both sides to solve for
y
y
y
:
x
5
+
8
7
=
y
\sqrt[7]{x^5 + 8} = y
7
x
5
+
8
=
y
.
Express inverse function:
Finally, we express the inverse function in terms of
x
x
x
:
f
−
1
(
x
)
=
x
5
+
8
7
f^{-1}(x) = \sqrt[7]{x^5 + 8}
f
−
1
(
x
)
=
7
x
5
+
8
.
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\newline
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