Question
Find \( f(g(x)) \) and \( g(f(x)) \) and determine whether the pair of functions \( f \) and \( g \) are inverses of each othe \( f(x)=x \) and \( g(x)=x \) \( f(g(x))=x \) \( g(f(x))=\square \)
Ask by Ramirez Bob. in the United States
Feb 04,2025
Real Tutor Solution
Tutor-Verified Answer
Answer
\( f(g(x)) = x \) and \( g(f(x)) = x \). Therefore, \( f \) and \( g \) are inverses of each other.
Solution
Let's analyze the given functions and their compositions to determine if \( f \) and \( g \) are inverses of each other.
### Given Functions:
- \( f(x) = x \)
- \( g(x) = x \)
### Composition of Functions:
1. **\( f(g(x)) \)**:
\[
f(g(x)) = f(x) = x
\]
2. **\( g(f(x)) \)**:
\[
g(f(x)) = g(x) = x
\]
So,
\[
g(f(x)) = x
\]
### Determining Inverses:
Two functions \( f \) and \( g \) are inverses of each other if:
\[
f(g(x)) = x \quad \text{and} \quad g(f(x)) = x \quad \text{for all } x \text{ in their domains}.
\]
From our calculations:
- \( f(g(x)) = x \)
- \( g(f(x)) = x \)
Since both compositions return \( x \), the functions \( f \) and \( g \) satisfy the condition for being inverse functions.
### Conclusion:
Yes, the functions \( f(x) = x \) and \( g(x) = x \) are inverses of each other.
\[
\boxed{
\begin{aligned}
f(g(x)) &= x \\
g(f(x)) &= x \\
\text{Thus, } f \text{ and } g \text{ are inverses of each other.}
\end{aligned}
}
\]
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Extra Insights
To find \( f(g(x)) \), we substitute \( g(x) \) into \( f(x) \): \[ f(g(x)) = f(x) = x. \] Now, let's find \( g(f(x)) \) by substituting \( f(x) \) into \( g(x) \): \[ g(f(x)) = g(x) = x. \] So we have \( f(g(x)) = x \) and \( g(f(x)) = x \). Since both compositions return \( x \), this indicates that \( f \) and \( g \) are indeed inverses of each other!