Question
For \( f(x)=x^{3} \) and \( g(x)=\sqrt[3]{x} \), find \( (f \circ g)(x) \) and \( (g \circ f)(x) \). Then determine whether \( (f \circ g)(x)=(g \circ f)(x) \). What is \( (f \circ g)(x) \) ? \( (f \circ g)(x)=x \) What is \( (g \circ f)(x) \) ? \( (g \circ f)(x)=\square \)
Ask by Medina Malone. in the United States
Mar 06,2025
Upstudy AI Solution
Tutor-Verified Answer
Answer
\( (f \circ g)(x) = x \) and \( (g \circ f)(x) = x \).
Solution
To find \( (f \circ g)(x) \) and \( (g \circ f)(x) \), we need to compose the functions \( f(x) \) and \( g(x) \) in the given order.
Given:
\( f(x) = x^3 \)
\( g(x) = \sqrt[3]{x} \)
1. To find \( (f \circ g)(x) \):
- Substitute \( g(x) \) into \( f(x) \):
- \( (f \circ g)(x) = f(g(x)) = f(\sqrt[3]{x}) = (\sqrt[3]{x})^3 = x \)
2. To find \( (g \circ f)(x) \):
- Substitute \( f(x) \) into \( g(x) \):
- \( (g \circ f)(x) = g(f(x)) = g(x^3) = \sqrt[3]{x^3} = x \)
Therefore, \( (f \circ g)(x) = x \) and \( (g \circ f)(x) = x \).
Since \( (f \circ g)(x) = (g \circ f)(x) = x \), we can conclude that \( (f \circ g)(x) = (g \circ f)(x) \).
So, \( (f \circ g)(x) = x \) and \( (g \circ f)(x) = x \).
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Beyond the Answer
Let's first clarify our function compositions. To find \( (f \circ g)(x) \): \[ (f \circ g)(x) = f(g(x)) = f\left(\sqrt[3]{x}\right) = \left(\sqrt[3]{x}\right)^{3} = x \] Now, for \( (g \circ f)(x) \): \[ (g \circ f)(x) = g(f(x)) = g(x^{3}) = \sqrt[3]{x^{3}} = x \] So, we have: \[ (g \circ f)(x) = x \] This leads us to conclude that \( (f \circ g)(x) = (g \circ f)(x) = x \). Therefore, the two compositions are equal! So, the final answers are: What is \( (g \circ f)(x) \)? \( (g \circ f)(x) = x \) And yes, \( (f \circ g)(x) = (g \circ f)(x) \).