Question:
If $f (a + b - x) = f (x)$, then $\int\limits^{b}_{{a}}x\, f\, (x) \,dx$ is equal to
If $f (a + b - x) = f (x)$, then $\int\limits^{b}_{{a}}x\, f\, (x) \,dx$ is equal to
Updated On: Jul 27, 2022
- $\frac{a+b}{2}\int\limits^{b}_{{a}}f(b-x) \,dx$
- $\frac{a+b}{2}\int\limits^{b}_{{a}}f(x) \,dx$
- $\frac{b-a}{2}\int\limits^{b}_{{a}}f(x)dx$
- $\frac{a+b}{2}\int\limits^{b}_{{a}}f(a+b-x)dx$
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The Correct Option is B
Solution and Explanation
$\int\limits^{b}_{{a}}x\, f\, (x) \,dx$
$=\int\limits^{b}_{{a}}(a+b-x) f (a + b - x) dx$.
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Concepts Used:
Integral
The representation of the area of a region under a curve is called to be as integral. The actual value of an integral can be acquired (approximately) by drawing rectangles.
- The definite integral of a function can be shown as the area of the region bounded by its graph of the given function between two points in the line.
- The area of a region is found by splitting it into thin vertical rectangles and applying the lower and the upper limits, the area of the region is summarized.
- An integral of a function over an interval on which the integral is described.
Also, F(x) is known to be a Newton-Leibnitz integral or antiderivative or primitive of a function f(x) on an interval I.
F'(x) = f(x)
For every value of x = I.
Types of Integrals:
Integral calculus helps to resolve two major types of problems:
- The problem of getting a function if its derivative is given.
- The problem of getting the area bounded by the graph of a function under given situations.