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Use the Leading Coefficient Test to determine the end behavior of the polynomial function. Then use this end behavior to match the function with its graph. \( f(x)=4 x^{3}-3 x^{2}-2 x+2 \)

Ask by Valdez Bryant. in Kuwait
Jan 03,2025

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The polynomial \( f(x) = 4x^{3} - 3x^{2} - 2x + 2 \) has an **odd degree** (3) and a **positive leading coefficient** (4). Therefore, as \( x \) approaches positive infinity, \( f(x) \) approaches positive infinity, and as \( x \) approaches negative infinity, \( f(x) \) approaches negative infinity. This means the graph of the function will rise to the right and fall to the left.

Solution

To determine the end behavior of the polynomial function \( f(x) = 4x^{3} - 3x^{2} - 2x + 2 \) using the **Leading Coefficient Test**, follow these steps: ### 1. Identify the Leading Term The **leading term** of a polynomial is the term with the highest power of \( x \). For \( f(x) \): - **Leading Term:** \( 4x^{3} \) ### 2. Determine the Degree and Leading Coefficient - **Degree:** The highest power of \( x \) is **3**. - **Leading Coefficient:** The coefficient of the leading term is **4** (which is positive). ### 3. Apply the Leading Coefficient Test The Leading Coefficient Test helps determine the end behavior based on the degree and the leading coefficient: - **If the degree is odd and the leading coefficient is positive:** - As \( x \to +\infty \), \( f(x) \to +\infty \). - As \( x \to -\infty \), \( f(x) \to -\infty \). - **If the degree is odd and the leading coefficient is negative:** - As \( x \to +\infty \), \( f(x) \to -\infty \). - As \( x \to -\infty \), \( f(x) \to +\infty \). - **If the degree is even and the leading coefficient is positive:** - As \( x \to \pm\infty \), \( f(x) \to +\infty \). - **If the degree is even and the leading coefficient is negative:** - As \( x \to \pm\infty \), \( f(x) \to -\infty \). ### 4. Determine the End Behavior for \( f(x) = 4x^{3} - 3x^{2} - 2x + 2 \) Given that: - **Degree:** 3 (which is **odd**) - **Leading Coefficient:** 4 (which is **positive**) **End Behavior:** - **As \( x \to +\infty \):** \( f(x) \to +\infty \) - **As \( x \to -\infty \):** \( f(x) \to -\infty \) ### 5. Matching the Function with Its Graph Based on the determined end behavior: - **Left Side of the Graph (\( x \to -\infty \)):** The graph will descend towards negative infinity. - **Right Side of the Graph (\( x \to +\infty \)):** The graph will rise towards positive infinity. When matching with possible graphs: - **Look for a graph where:** - The **left end** falls downwards. - The **right end** rises upwards. - The graph may have **turning points** or **intercepts** corresponding to the roots of the polynomial, but the primary feature to match is the end behavior described above. ### Visualization While I cannot display a graph here, you can visualize the general shape of \( f(x) = 4x^{3} - 3x^{2} - 2x + 2 \) as follows: 1. **Starts** from the bottom left (since \( f(x) \to -\infty \) as \( x \to -\infty \)). 2. **Rises** to the top right (since \( f(x) \to +\infty \) as \( x \to +\infty \)). 3. **Crosses** the y-axis at \( f(0) = 2 \). 4. **Has Turning Points:** As it's a cubic polynomial, it can have up to two turning points. When presented with multiple graphs, select the one that aligns with this end behavior pattern.

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Beyond the Answer

To determine the end behavior of the polynomial function \( f(x)=4 x^{3}-3 x^{2}-2 x+2 \), we focus on the leading term, which is \( 4x^3 \). Since the leading coefficient (4) is positive and the degree (3) is odd, as \( x \) approaches positive infinity (\( x \to +\infty \)), \( f(x) \) approaches positive infinity (\( f(x) \to +\infty \)), and as \( x \) approaches negative infinity (\( x \to -\infty \)), \( f(x) \) approaches negative infinity (\( f(x) \to -\infty \)). So, the end behavior indicates that the graph will rise to the right and fall to the left, which can help you match the function to the appropriate graph. Look for a graph that has these characteristics: rising steeply on the right side and dropping steeply on the left side.

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