Find the following integral: \(\int \frac{x^3+5x^2-4}{x^2}dx\)
Solution and Explanation
\(\int \frac{x^3+5x^2-4}{x^2}dx\)
=\(\int (x+5-4x^{-2})dx\)
=\(\int xdx +5 \int 1.dx-4\int x^{-2}dx\)
=\(\frac{x^2}{2}+5x-4\bigg(\frac{x^{-1}}{-1}\bigg)+C\)
=\(\frac{x^2}{2}+5x+\frac{4}{x}+C\)
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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.