What is the integral of x^2(2x+1) ?

The integral of x^2(2x+1) is (x^4)/2+(x^3)/3+C

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integral of x^2(2x+1)

\int x^{2} (2 x + 1) d x

\frac{x ^{4}}{2} + \frac{x ^{3}}{3} + C

Solution steps

\int x^{2} (2 x + 1) d x

Expand

x^{2} (2 x + 1) : 2 x^{3} + x^{2}

= \int 2 x^{3} + x^{2} 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 2 x^{3} d x + \int x^{2} d x

\int 2 x^{3} d x = \frac{x ^{4}}{2}

\int x^{2} d x = \frac{x ^{3}}{3}

= \frac{x ^{4}}{2} + \frac{x ^{3}}{3}

Add a constant to the solution

= \frac{x ^{4}}{2} + \frac{x ^{3}}{3} + C

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What is the integral of x^2(2x+1) ?
The integral of x^2(2x+1) is (x^4)/2+(x^3)/3+C