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Question
cubic & cube root functions as inverses quick check
if a function is translated 6 units down, in which direction will the inverse of the function be transformed? (1 point)
the inverse of the given function will be translated 6 units up.
the inverse of the given function will be translated 6 units left.
the inverse of the given function will be translated 6 units right.
the inverse of the given function will be translated 6 units down.
To determine the transformation of the inverse function when the original function is translated 6 units down, we use the property of inverse functions and their graphs. The graph of an inverse function is the reflection of the original function's graph over the line \( y = x \). A vertical translation (up/down) of the original function corresponds to a horizontal translation (left/right) of the inverse function, and vice versa. When a function is translated down (vertical direction), its inverse will be translated in the horizontal direction. Specifically, a vertical shift down by \( a \) units in the original function results in a horizontal shift left by \( a \) units in the inverse? Wait, no—wait, let's correct that. Wait, actually, for a function \( y = f(x) \), if we have \( y = f(x) - 6 \) (translated 6 units down), to find the inverse, we solve for \( x \) in terms of \( y \). Let's take a simple example: suppose \( f(x)=x \), so \( y = x - 6 \). To find the inverse, swap \( x \) and \( y \): \( x = y - 6 \), then solve for \( y \): \( y = x + 6 \). Wait, that's a horizontal shift? Wait, no, \( y = x + 6 \) is a vertical shift up? Wait, no, maybe my example is too simple. Wait, let's think about the reflection over \( y = x \). If the original function is shifted down (decreasing \( y \)-values), the inverse function, which swaps \( x \) and \( y \), will have its \( x \)-values affected? Wait, no—when you reflect over \( y = x \), a vertical translation (down) of the original function becomes a horizontal translation (left or right)? Wait, no, let's use the graph. The original function \( y = f(x) \) shifted down 6 is \( y = f(x) - 6 \). The inverse function is found by solving \( x = f(y) - 6 \), so \( f(y) = x + 6 \), then \( y = f^{-1}(x + 6) \). So the inverse function \( f^{-1}(x) \) is transformed to \( f^{-1}(x + 6) \), which is a horizontal shift left by 6 units? Wait, but in my first example, \( f(x)=x \), \( y = x - 6 \), inverse is \( y = x + 6 \), which is a vertical shift up. Wait, that contradicts. Wait, no—if \( f(x)=x \), then \( f^{-1}(x)=x \). If we have \( y = f(x) - 6 = x - 6 \), then the inverse is found by \( x = y - 6 \implies y = x + 6 \), which is \( f^{-1}(x) + 6 \), so a vertical shift up. Wait, so maybe my initial thought was wrong. Let's clarify: the key is that for the inverse function, swapping \( x \) and \( y \) means that a vertical shift in the original function corresponds to a horizontal shift in the inverse? No, in the example, the original function is shifted down (vertical), and the inverse is shifted up (vertical). Wait, that's because when we swap \( x \) and \( y \), a vertical shift in \( y \) (original) becomes a horizontal shift in \( x \) (inverse), but when we solve for \( y \) in the inverse, it becomes a vertical shift. Wait, maybe the confusion is between horizontal and vertical shifts. Let's take the function \( y = f(x) \). If we translate it 6 units down, we get \( y = f(x) - 6 \). To find the inverse, we set \( x = f(y) - 6 \), so \( f(y) = x + 6 \), hence \( y = f^{-1}(x + 6) \). So the inverse function is \( f^{-1}(x + 6) \), which is a horizontal shift left by 6 units? But in the linear example, \( f(x)=x \), \( f^{-1}(x)=x \), so \( f^{-1}(x + 6)=x + 6 \), which is a vertical shift up by 6 units. Wait, that's the same as \( y = x + 6 \), which is a vertical shift up. So a horizontal shift left in the inverse function's input ( \( f^{-1}(x + 6) \)) is equivalent to a vertical shift up in the output. So the inverse function is translated 6 units up. Wait, that makes se…
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A. The inverse of the given function will be translated 6 units up.