Question

Determine the average value of the function \( f(x) = e^{x} \) from \( x = 0 \) to \( x = 2 \).

Ask by Peterson Horton. in Pakistan
Jan 19,2025

Real Tutor Solution

Tutor-Verified Answer

Answer

The average value of \( f(x) = e^{x} \) from \( x = 0 \) to \( x = 2 \) is \( \frac{e^{2} - 1}{2} \), which is approximately 3.1945.

Solution

To find the **average value** of the function \( f(x) = e^{x} \) over the interval from \( x = 0 \) to \( x = 2 \), we use the formula for the average value of a function over an interval \([a, b]\): \[ \text{Average} = \frac{1}{b - a} \int_{a}^{b} f(x) \, dx \] **Applying the formula:** 1. **Identify the bounds and the function:** - \( a = 0 \) - \( b = 2 \) - \( f(x) = e^{x} \) 2. **Set up the integral:** \[ \text{Average} = \frac{1}{2 - 0} \int_{0}^{2} e^{x} \, dx = \frac{1}{2} \int_{0}^{2} e^{x} \, dx \] 3. **Compute the integral:** \[ \int e^{x} \, dx = e^{x} + C \] Evaluating from 0 to 2: \[ \int_{0}^{2} e^{x} \, dx = e^{2} - e^{0} = e^{2} - 1 \] 4. **Calculate the average value:** \[ \text{Average} = \frac{e^{2} - 1}{2} \] **Final Answer:** \[ \boxed{\dfrac{e^{2} - 1}{2}} \] If you prefer a numerical approximation: - \( e^{2} \approx 7.389 \) - Therefore, \( \frac{7.389 - 1}{2} \approx \frac{6.389}{2} \approx 3.1945 \) So, the average value is approximately **3.1945**.

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Beyond the Answer

To find the average value of the function \( f(x) = e^{x} \) from \( x = 0 \) to \( x = 2 \), we use the formula for the average value of a continuous function on the interval \([a, b]\): \[ \text{Average value} = \frac{1}{b-a} \int_a^b f(x) \, dx \] In this case, \( a = 0 \) and \( b = 2 \). Thus, we have: \[ \text{Average value} = \frac{1}{2-0} \int_0^2 e^x \, dx = \frac{1}{2} \int_0^2 e^x \, dx \] Next, we compute the integral \( \int e^x \, dx \): \[ \int e^x \, dx = e^x + C \] Now, we evaluate the definite integral from 0 to 2: \[ \int_0^2 e^x \, dx = [e^x]_0^2 = e^2 - e^0 = e^2 - 1 \] Substituting this back into the average value formula gives us: \[ \text{Average value} = \frac{1}{2} (e^2 - 1) \] Thus, the average value of the function \( f(x) = e^{x} \) from \( x = 0 \) to \( x = 2 \) is: \[ \text{Average value} = \frac{e^2 - 1}{2} \]

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