Pregunta
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Which graph shows \( f(x)=2^{x}+2 \) and the transformation \( g(x)=2^{-x}+2 \) ? Note: The given point in the preimage corresponds to the given point in the image.

Ask by Sandoval Turnbull. in the United States
Mar 12,2025

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The graph of \( g(x) = 2^{-x} + 2 \) is the reflection of \( f(x) = 2^x + 2 \) across the y-axis. Both graphs have a horizontal asymptote at \( y = 2 \) and pass through the point \( (0, 3) \).

Solución

To analyze the functions \( f(x) = 2^x + 2 \) and \( g(x) = 2^{-x} + 2 \), we can break down the transformations involved. 1. **Understanding \( f(x) = 2^x + 2 \)**: - This is an exponential function that grows as \( x \) increases. - The graph of \( f(x) \) has a horizontal asymptote at \( y = 2 \) and passes through the point \( (0, 3) \) since \( f(0) = 2^0 + 2 = 3 \). 2. **Understanding \( g(x) = 2^{-x} + 2 \)**: - This function is a reflection of \( f(x) \) across the y-axis because \( g(x) = f(-x) \). - The graph of \( g(x) \) also has a horizontal asymptote at \( y = 2 \) and passes through the point \( (0, 3) \) since \( g(0) = 2^{-0} + 2 = 3 \). 3. **Transformation**: - The transformation from \( f(x) \) to \( g(x) \) involves reflecting the graph of \( f(x) \) across the y-axis. This means that for every point \( (a, b) \) on the graph of \( f(x) \), there is a corresponding point \( (-a, b) \) on the graph of \( g(x) \). To visualize this, we can plot both functions: - The graph of \( f(x) \) will rise steeply as \( x \) increases and approach \( y = 2 \) as \( x \) decreases. - The graph of \( g(x) \) will fall steeply as \( x \) increases and also approach \( y = 2 \) as \( x \) decreases. Now, if you have specific graphs to compare, look for the one that shows the reflection of \( f(x) \) across the y-axis, maintaining the same horizontal asymptote at \( y = 2 \) and passing through the same point \( (0, 3) \). If you provide the graphs, I can help identify which one corresponds to \( g(x) \).

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Beyond the Answer

The function \( f(x) = 2^x + 2 \) is an exponential function that increases rapidly as \( x \) increases, starting at \( y = 3 \) when \( x = 0 \). Its transformation \( g(x) = 2^{-x} + 2 \) reflects \( f(x) \) across the vertical axis (the y-axis), changing its growth to a decay. This means that while \( f(x) \) shoots up as you move to the right, \( g(x) \) falls as you head in the same direction, ultimately approaching the horizontal asymptote of \( y = 2 \). To visualize this, if you sketch both graphs, you'll see \( f(x) \) curving upward and intersecting the y-axis at \( (0, 3) \), while \( g(x) \) will intersect the y-axis at the same point but will curve downward from there, emphasizing how reflections can dramatically change the behavior of exponential functions!

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