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Determine the function values, if possible. Express all numbers as integers or simplified fractions. Select "Undefined" if applicable. \[ f(x)=\frac{4}{x+2} \]

Ask by Goodwin Ball. in the United States
Jan 13,2025

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Answer

The function \( f(x) = \frac{4}{x + 2} \) is defined for all real numbers except \( x = -2 \), where it is undefined. For other values of \( x \), the function can be evaluated as follows: - \( f(0) = 2 \) - \( f(1) = \frac{4}{3} \) - \( f(-3) = -4 \) - \( f(-2) \) is **Undefined** Ensure to simplify all fractions and express the results as integers or simplified fractions.

Solution

To determine the function values for \( f(x) = \frac{4}{x + 2} \), we'll evaluate the function for specific values of \( x \). However, since no specific \( x \)-values were provided, I'll outline the general approach and highlight important points about the function. ### **Understanding the Function \( f(x) = \frac{4}{x + 2} \)** 1. **Domain of the Function:** - The function is defined for all real numbers except where the denominator is zero. - Set the denominator equal to zero and solve for \( x \): \[ x + 2 = 0 \quad \Rightarrow \quad x = -2 \] - **Domain:** All real numbers \( \mathbb{R} \) except \( x = -2 \). - **Undefined Point:** \( x = -2 \) (At this point, the function is **Undefined**). 2. **Evaluating \( f(x) \) for Specific Values:** - **Example 1:** \( x = 0 \) \[ f(0) = \frac{4}{0 + 2} = \frac{4}{2} = 2 \] - **Example 2:** \( x = 1 \) \[ f(1) = \frac{4}{1 + 2} = \frac{4}{3} \] - **Example 3:** \( x = -3 \) \[ f(-3) = \frac{4}{-3 + 2} = \frac{4}{-1} = -4 \] - **Example 4:** \( x = -2 \) \[ f(-2) = \frac{4}{-2 + 2} = \frac{4}{0} \quad \text{(Undefined)} \] 3. **Summary of Function Values:** | \( x \) | \( f(x) \) | |---------|--------------------| | 0 | \( 2 \) | | 1 | \( \frac{4}{3} \) | | -3 | \( -4 \) | | -2 | **Undefined** | ### **Key Points to Remember:** - **Undefined Point:** \( x = -2 \) makes the denominator zero, rendering \( f(x) \) undefined. - **Simplified Fractions:** Ensure that all fractions are simplified. For example, \( \frac{4}{2} = 2 \) and \( \frac{4}{3} \) is already in its simplest form. - **Expressing as Integers or Simplified Fractions:** Always simplify the function values as much as possible unless the result is undefined. If you have specific \( x \)-values you'd like to evaluate, feel free to provide them, and I can calculate the corresponding \( f(x) \) values for you!

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Bonus Knowledge

To find the function values, we can substitute various inputs into the function \( f(x) = \frac{4}{x+2} \). 1. For \( f(0) \): \[ f(0) = \frac{4}{0 + 2} = \frac{4}{2} = 2. \] 2. For \( f(-1) \): \[ f(-1) = \frac{4}{-1 + 2} = \frac{4}{1} = 4. \] 3. For \( f(-2) \): \[ f(-2) = \frac{4}{-2 + 2} = \frac{4}{0}, \] which is **Undefined** since division by zero is not possible. 4. For \( f(2) \): \[ f(2) = \frac{4}{2 + 2} = \frac{4}{4} = 1. \] So, the function values for different inputs are: - \( f(0) = 2 \) - \( f(-1) = 4 \) - \( f(-2) = \text{Undefined} \) - \( f(2) = 1 \)

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