EXAMPLE 2 Since f(x) = 4 + x2 is continuous on the interval [−4, 2], the Mean Value Theorem for Integrals says there is a number c in [−4, 2] such that2−4(4 + x2) dx = f(c)[2 − (−4)].In this particular case we can find c explicitly. Using this example, we find that fave = 8, so the value of c satisfiesf(c) = fave = 8.Therefore4 + c2 = soc2 = .So in this case there happen to be two numbers c = ± 2 in the interval [−4, 2] that work in the Mean Value Theorem for Integrals.
Question
EXAMPLE 2 Since f(x) = 4 + x2 is continuous on the interval [−4, 2], the Mean Value Theorem for Integrals says there is a number c in [−4, 2] such that2−4(4 + x2) dx = f(c)[2 − (−4)].In this particular case we can find c explicitly. Using this example, we find that fave = 8, so the value of c satisfiesf(c) = fave = 8.Therefore4 + c2 = soc2 = .So in this case there happen to be two numbers c = ± 2 in the interval [−4, 2] that work in the Mean Value Theorem for Integrals.
Solution
The text you provided is incomplete and seems to be missing some information. However, I can explain the Mean Value Theorem for Integrals using the given function f(x) = 4 + x^2.
The Mean Value Theorem for Integrals states that if f is continuous on the closed interval [a, b], then there exists at least one number c in the interval (a, b) such that the area under the curve y = f(x) from a to b is equal to f(c) times (b - a).
In this case, the function f(x) = 4 + x^2 is continuous on the interval [-4, 2]. So, according to the theorem, there exists a number c in [-4, 2] such that:
∫ from -4 to 2 (4 + x^2) dx = f(c) * [2 - (-4)]
To find the average value of the function (fave) on the interval [-4, 2], we divide the integral of the function over the interval by the width of the interval:
fave = (1/(2 - (-4))) * ∫ from -4 to 2 (4 + x^2) dx
The text states that fave = 8. So, we set f(c) equal to fave:
4 + c^2 = 8
Solving for c, we get:
c^2 = 8 - 4 c^2 = 4 c = ±2
So, there are two numbers, c = -2 and c = 2, in the interval [-4, 2] that satisfy the Mean Value Theorem for Integrals.
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