Let f be a function such that 𝑓(−𝑥) = −𝑓(𝑥) for all x. If ∫02𝑓(𝑥)𝑑𝑥=5, then ∫−22(𝑓(𝑥)+6)𝑑𝑥=Responses661616242434
Question
Let f be a function such that for all x. If , then
Responses
661616242434
Solution
The function f(x) is an odd function because it satisfies the property f(-x) = -f(x).
The integral of an odd function over a symmetric interval is zero. This is because the areas above and below the x-axis cancel each other out.
So, ∫ from -2 to 2 of f(x) dx = 0.
Now, consider the integral ∫ from -2 to 2 of (f(x) + 6) dx.
This can be split into two integrals: ∫ from -2 to 2 of f(x) dx + ∫ from -2 to 2 of 6 dx.
As we've already established, ∫ from -2 to 2 of f(x) dx = 0.
The integral ∫ from -2 to 2 of 6 dx is a simple one. The antiderivative of 6 is 6x, so this integral evaluates to 62 - 6(-2) = 24.
Therefore, ∫ from -2 to 2 of (f(x) + 6) dx = 0 + 24 = 24.
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