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Let’s check out your problem:
For the function
f
(
x
)
=
x
3
−
8
5
f(x)=\frac{x^{3}-8}{5}
f
(
x
)
=
5
x
3
−
8
, find
f
−
1
(
x
)
f^{-1}(x)
f
−
1
(
x
)
.
\newline
f
−
1
(
x
)
=
5
x
3
+
8
f^{-1}(x)=5 \sqrt[3]{x}+8
f
−
1
(
x
)
=
5
3
x
+
8
\newline
f
−
1
(
x
)
=
5
x
+
8
3
f^{-1}(x)=\sqrt[3]{5 x+8}
f
−
1
(
x
)
=
3
5
x
+
8
\newline
f
−
1
(
x
)
=
5
(
x
+
8
)
3
f^{-1}(x)=\sqrt[3]{5(x+8)}
f
−
1
(
x
)
=
3
5
(
x
+
8
)
\newline
f
−
1
(
x
)
=
5
x
+
8
3
f^{-1}(x)=5 \sqrt[3]{x+8}
f
−
1
(
x
)
=
5
3
x
+
8
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Math Problems
Calculus
Find derivatives of using multiple formulae
Full solution
Q.
For the function
f
(
x
)
=
x
3
−
8
5
f(x)=\frac{x^{3}-8}{5}
f
(
x
)
=
5
x
3
−
8
, find
f
−
1
(
x
)
f^{-1}(x)
f
−
1
(
x
)
.
\newline
f
−
1
(
x
)
=
5
x
3
+
8
f^{-1}(x)=5 \sqrt[3]{x}+8
f
−
1
(
x
)
=
5
3
x
+
8
\newline
f
−
1
(
x
)
=
5
x
+
8
3
f^{-1}(x)=\sqrt[3]{5 x+8}
f
−
1
(
x
)
=
3
5
x
+
8
\newline
f
−
1
(
x
)
=
5
(
x
+
8
)
3
f^{-1}(x)=\sqrt[3]{5(x+8)}
f
−
1
(
x
)
=
3
5
(
x
+
8
)
\newline
f
−
1
(
x
)
=
5
x
+
8
3
f^{-1}(x)=5 \sqrt[3]{x+8}
f
−
1
(
x
)
=
5
3
x
+
8
Eliminate denominator by multiplication:
Multiply both sides by
5
5
5
to eliminate the denominator:
\newline
5
x
=
y
3
−
8
5x = y^3 - 8
5
x
=
y
3
−
8
Isolate cubic term by addition:
Add
8
8
8
to both sides to isolate the cubic term:
\newline
5
x
+
8
=
y
3
5x + 8 = y^3
5
x
+
8
=
y
3
Solve for
y
y
y
by taking cube root:
Take the cube root of both sides to solve for
y
y
y
:
\newline
y
=
5
x
+
8
3
y = \sqrt[3]{5x + 8}
y
=
3
5
x
+
8
Write inverse function:
Now that we have solved for
y
y
y
, we can write the inverse function as:
\newline
f
−
1
(
x
)
=
5
x
+
8
3
f^{-1}(x) = \sqrt[3]{5x + 8}
f
−
1
(
x
)
=
3
5
x
+
8
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Find the derivative of
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Find the derivative of
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x
)
=
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(
x
)
=
x
+
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\newline
f
′
(
x
)
=
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f
′
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x
)
=
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