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What is the inverse graph of $f(x) = x³$?

A) $y = \sqrt[3]{x}$
B) $y = x{¹/³}$
C) $y = x²$
D) $y = x⁻³$

User Wpp
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1 Answer

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Final Answer:

The inverse graph of $f(x) = x³$ is represented by option B) $y = x^{1/3}$.

Step-by-step explanation:

The inverse function undoes the operation of the original function, swapping the roles of input and output. To find the inverse of $f(x) = x³$, we switch $x$ and $y$ and solve for $y$:

1. Start with the original function: $y = x³$.

2. Swap $x$ and $y$: $x = y³$.

3. Solve for $y$: $y = x^{1/3}$.

This reveals that the inverse function is $y = x^{1/3}$, corresponding to option B.

The cube root function, $y = x^{1/3}$, is indeed the inverse of $f(x) = x³$. When you compose these functions, $f\left(x^{1/3}\right) = \left(x^{1/3}\right)³ = x$. This confirms the inverse relationship. Option A) $y = \sqrt[3]{x}$ is not equivalent to $y = x^{1/3}$; the square root and cube root are distinct operations. Options C) $y = x²$ and D) $y = x^{-3}$ are not inverses; one represents squaring, and the other represents raising to the power of -3, neither of which undoes the cube operation. Therefore, the correct answer is B) $y = x^{1/3}$.

User Labeo
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