Inverse Function B28D3E
1. The problem is to draw the graph of the inverse function of a given function.
2. The inverse function, denoted as $f^{-1}(x)$, reverses the roles of inputs and outputs of the original function $f(x)$. If $f(a) = b$, then $f^{-1}(b) = a$.
3. To find the inverse function algebraically, swap $x$ and $y$ in the equation $y = f(x)$ and solve for $y$.
4. The graph of the inverse function is the reflection of the graph of the original function across the line $y = x$.
5. Important rule: The function must be one-to-one (pass the horizontal line test) to have an inverse that is also a function.
6. Steps to draw the inverse graph:
- Plot the original function.
- Draw the line $y = x$ as a reference.
- Reflect each point of the original graph across the line $y = x$.
- Connect these reflected points smoothly to form the inverse function graph.
7. Example: If $f(x) = 2x + 3$, then to find $f^{-1}(x)$:
- Write $y = 2x + 3$.
- Swap $x$ and $y$: $x = 2y + 3$.
- Solve for $y$: $y = \frac{x - 3}{2}$.
8. The inverse function is $f^{-1}(x) = \frac{x - 3}{2}$.
9. The graph of $f^{-1}(x)$ is the reflection of $f(x)$ across $y = x$.
Final answer: To draw the inverse function graph, reflect the original function's graph across the line $y = x$ after confirming the function is one-to-one and finding the inverse algebraically if needed.