Integral of
The integral of is .
How to work it out
- 1
We want an antiderivative of f(x) = 5 * .
- 2
Method: constant multiple and power rule.
- 3
That gives the antiderivative; add the constant C because any constant disappears when you differentiate:
- 4
Check by differentiating the answer; you must get the original function back:
- 5
As a definite integral, evaluate the antiderivative at both ends and subtract. Between 0 and 1:
LaTeX source of the formulas on this page
\[ \int 5 x^{1}\,dx = \frac{5 x^{2}}{2} + C \]
\[ \int 5 x^{1}\,dx \]
\[ \frac{d}{dx}\left[\frac{5 x^{2}}{2}\right] = \frac{20 x}{4} \]
\[ \int_{0}^{1} 5 x^{1}\,dx = \Big[\frac{5 x^{2}}{2}\Big]_{0}^{1} \approx 2.5 \]Definite integrals of the same function
| Interval | Value |
|---|---|
| from 0 to 1 | 2.5 |
| from 0 to 0.5 | 0.625 |
Questions
What is the integral of 5 * ?
The integral of is .
Why do we add + C?
Every function F(x) + C has the same derivative, so the antiderivative is only defined up to a constant.
What is the integral of 5 * from 0 to 1?
About 2.5.