Integral of
The integral of is .
How to work it out
- 1
We want an antiderivative of f(x) = 3 * .
- 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
\[ \int 3 x^{4}\,dx = \frac{3 x^{5}}{5} + C \]
\[ \int 3 x^{4}\,dx \]
\[ \frac{d}{dx}\left[\frac{3 x^{5}}{5}\right] = \frac{75 x^{4}}{25} \]
\[ \int_{0}^{1} 3 x^{4}\,dx = \Big[\frac{3 x^{5}}{5}\Big]_{0}^{1} \approx 0.6 \]Definite integrals of the same function
| Interval | Value |
|---|---|
| from 0 to 1 | 0.6 |
| from 0 to 0.5 | 0.01875 |
Questions
What is the integral of 3 * ?
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 3 * from 0 to 1?
About 0.6.