Question

Consider the function \( f(x) = \sqrt{x} \). Describe how you would graph its inverse, and explain any transformations that occur.

Ask by Olson Carlson. in South Africa
Jan 10,2025

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Tutor-Verified Answer

Answer

To graph the inverse of \( f(x) = \sqrt{x} \), reflect its graph across the line \( y = x \). This transforms the square root curve into a parabola opening upwards.

Solution

To graph the inverse of the function \( f(x) = \sqrt{x} \), we need to follow these steps: 1. **Find the Inverse Function**: The first step is to find the inverse of the function \( f(x) \). To do this, we replace \( f(x) \) with \( y \): \[ y = \sqrt{x} \] Next, we solve for \( x \) in terms of \( y \): \[ y^2 = x \quad \Rightarrow \quad x = y^2 \] Thus, the inverse function is: \[ f^{-1}(x) = x^2 \] 2. **Graph the Original Function**: The graph of \( f(x) = \sqrt{x} \) is a curve that starts at the origin (0,0) and increases to the right, approaching infinity as \( x \) increases. The domain of this function is \( x \geq 0 \) and the range is \( y \geq 0 \). 3. **Graph the Inverse Function**: The graph of the inverse function \( f^{-1}(x) = x^2 \) is a parabola that opens upwards. The domain of this function is \( x \geq 0 \) (since the output of the original function is non-negative), and the range is \( y \geq 0 \). 4. **Transformations**: The graph of the inverse function can be obtained from the graph of the original function by reflecting it across the line \( y = x \). This line acts as a mirror, and every point \( (a, b) \) on the original function corresponds to the point \( (b, a) \) on the inverse function. 5. **Summary of Transformations**: - The original function \( f(x) = \sqrt{x} \) is transformed into its inverse \( f^{-1}(x) = x^2 \) through reflection across the line \( y = x \). - The shape of the graph changes from a curve (the square root function) to a parabola (the square function). In conclusion, to graph the inverse of \( f(x) = \sqrt{x} \), we reflect the graph of the original function across the line \( y = x \), resulting in the graph of \( f^{-1}(x) = x^2 \).

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The Deep Dive

To graph the inverse of the function \( f(x) = \sqrt{x} \), we first find its inverse. By switching the roles of \( x \) and \( y \) and then solving for \( y \), we find that the inverse function is \( f^{-1}(x) = x^2 \). To graph this, you can take the original function's graph and reflect it over the line \( y = x \). This reflection transforms the square root function, which starts at (0,0) and rises gradually to the right, into the quadratic function, which opens upwards starting at (0,0) and curves sharply away from the axis as \( x \) increases. Additionally, consider the domain and range shifts: the function \( f(x) = \sqrt{x} \) has a domain of \( x \geq 0 \) and a range of \( y \geq 0 \). When graphing its inverse \( f^{-1}(x) = x^2 \), the roles reverse—now it has a domain of \( x \geq 0 \) and a range of \( y \geq 0 \) as well, since the inverse reflects the original values. This interconnectedness between functions and their inverses is a beautifully simple yet profound concept!

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