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Popular >

integral of x^3(x+1)

Solution

\int x^{3} (x + 1) d x

Solution

\frac{x ^{5}}{5} + \frac{x ^{4}}{4} + C

Solution steps

\int x^{3} (x + 1) d x

Expand

x^{3} (x + 1) : x^{4} + x^{3}

= \int x^{4} + x^{3} d x

Apply the Sum Rule:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

= \int x^{4} d x + \int x^{3} d x

\int x^{4} d x = \frac{x ^{5}}{5}

\int x^{3} d x = \frac{x ^{4}}{4}

= \frac{x ^{5}}{5} + \frac{x ^{4}}{4}

Add a constant to the solution

= \frac{x ^{5}}{5} + \frac{x ^{4}}{4} + C

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Frequently Asked Questions (FAQ)

What is the integral of x^3(x+1) ?
The integral of x^3(x+1) is (x^5)/5+(x^4)/4+C