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The function \( f(x)=x^{3} \) has been translated 3 to the right and 5 up. Then it undergoes a vertical stretch by a factor of 2 , followed by a reflection over the \( x- \) \( g(x)= \) axis. What is the new function? Show each step - You can get partial credit.

Ask by Allan Christensen. in the United States
Feb 27,2025

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Answer

The new function after all transformations is \( g(x) = -2(x - 3)^3 - 10 \).

Solution

We start with the original function:   f(x) = x³ Step 1: Translate 3 units to the right and 5 units up.   Replace x with (x - 3) for the horizontal translation and add 5 for the vertical translation.   New function: f₁(x) = (x - 3)³ + 5 Step 2: Apply a vertical stretch by a factor of 2.   Multiply the entire function f₁(x) by 2.   New function: f₂(x) = 2[(x - 3)³ + 5] = 2(x - 3)³ + 10 Step 3: Reflect over the x-axis.   Multiply the entire function f₂(x) by -1 to reflect it.   New function: g(x) = -[2(x - 3)³ + 10] = -2(x - 3)³ - 10 Thus, the transformed function is:   g(x) = -2(x - 3)³ - 10

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To transform the function \( f(x) = x^3 \) according to the given instructions, we can break it down step-by-step. 1. **Translation 3 to the right:** Translating a function \( f(x) \) to the right by \( a \) units involves replacing \( x \) with \( x - a \). Therefore, translating \( f(x) = x^3 \) 3 units to the right gives: \[ f(x - 3) = (x - 3)^3 \] 2. **Translation 5 up:** To translate the function upward by \( b \) units, we add \( b \) to the function. Thus, we add 5 to our previous result: \[ g(x) = (x - 3)^3 + 5 \] 3. **Vertical stretch by a factor of 2:** A vertical stretch by a factor of \( k \) can be achieved by multiplying the function by \( k \). Therefore, we multiply \( g(x) \) by 2: \[ g(x) = 2 \left( (x - 3)^3 + 5 \right) = 2(x - 3)^3 + 10 \] 4. **Reflection over the x-axis:** Reflecting a function over the \( x \)-axis means multiplying the entire function by -1. Thus, we perform this step: \[ g(x) = -\left( 2(x - 3)^3 + 10 \right) = -2(x - 3)^3 - 10 \] Putting it all together, the final transformed function is: \[ g(x) = -2(x - 3)^3 - 10 \]

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