Question
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If \( x \) is divided by 2 and then 4 is subtracted, then the function is \( f(x)=x \div 2-4 \). What are the steps to find the inverse to this function? a.) Divide by 4 , then subtract by 2 b.) Multiply by 2 , then add 4 c.) Subtract 2 , then multiply by 4 d.) Add 4 , then multiply by 2

Ask by Salinas Cole. in the United States
Jan 26,2025

Real Tutor Solution

Tutor-Verified Answer

Answer

To find the inverse of \( f(x) = \frac{x}{2} - 4 \), add 4 to the input and then multiply by 2. So, the correct choice is **d.) Add 4, then multiply by 2**.

Solution

To find the inverse of the function \( f(x) = \frac{x}{2} - 4 \), follow these steps: 1. **Start with the original function:** \[ y = \frac{x}{2} - 4 \] 2. **Solve for \( x \) in terms of \( y \):** \[ y + 4 = \frac{x}{2} \] \[ x = 2(y + 4) \] \[ x = 2y + 8 \] 3. **Express the inverse function:** \[ f^{-1}(y) = 2y + 8 \] This means that to find the inverse, you should **add 4** to the input and then **multiply by 2**. **Correct Answer:** **d.) Add 4, then multiply by 2**

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Mind Expander

To find the inverse of the function \( f(x) = \frac{x}{2} - 4 \), you want to reverse the operations performed on \( x \). Start by isolating \( x \) in terms of \( y \). First, you can add 4 to both sides to counteract the subtraction, giving you \( y + 4 = \frac{x}{2} \). Next, multiply both sides by 2 to eliminate the division, resulting in \( x = 2(y + 4) \). Once rearranged, you'll see that the correct operation is indeed to first add 4, and then multiply by 2. So the correct answer is: d.) Add 4, then multiply by 2. Now you can express the inverse function as \( f^{-1}(y) = 2(y + 4) \), which neatly reverses the original transformation performed by \( f(x) \). Happy calculating!

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