Problem

For the function $f(x)=\frac{x^{\frac{1}{3}}}{5}$, find $f^{-1}(x)$.

Answer

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Answer

So, the inverse function is \(f^{-1}(x) = \boxed{125x^3}\).

Steps

Step 1 :\(f^{-1}(x)\) is defined as the number \(y\) such that \(f(y)=x\). Thus, we solve the equation \(\frac{y^{\frac{1}{3}}}{5} = x\).

Step 2 :Multiplying both sides by 5, we have \(y^{\frac{1}{3}} = 5x\).

Step 3 :Now, we raise both sides to the power of 3 to eliminate the cube root: \((y^{\frac{1}{3}})^3 = (5x)^3\).

Step 4 :This simplifies to \(y = 125x^3\).

Step 5 :So, the inverse function is \(f^{-1}(x) = \boxed{125x^3}\).

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