What is the integral of (ar^3+br)(2pir) ?

The integral of (ar^3+br)(2pir) is 2pi((ar^5)/5+(br^3)/3)+C

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integral of (ar^3+br)(2pir)

\int (a r^{3} + b r) (2 π r) d r

2 π (\frac{a r ^{5}}{5} + \frac{b r ^{3}}{3}) + C

Solution steps

\int (a r^{3} + b r) \cdot 2 π r d r

Take the constant out:

\int a \cdot f (x) d x = a \cdot \int f (x) d x

= 2 π \cdot \int (a r^{3} + b r) r d r

Expand

(a r^{3} + b r) r : a r^{4} + b r^{2}

= 2 π \cdot \int a r^{4} + b r^{2} d r

Apply the Sum Rule:

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

= 2 π (\int a r^{4} d r + \int b r^{2} d r)

\int a r^{4} d r = \frac{a r ^{5}}{5}

\int b r^{2} d r = \frac{b r ^{3}}{3}

= 2 π (\frac{a r ^{5}}{5} + \frac{b r ^{3}}{3})

Add a constant to the solution

= 2 π (\frac{a r ^{5}}{5} + \frac{b r ^{3}}{3}) + C

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What is the integral of (ar^3+br)(2pir) ?
The integral of (ar^3+br)(2pir) is 2pi((ar^5)/5+(br^3)/3)+C