What is the integral of 18x^2(2x^3+1)^2 ?

The integral of 18x^2(2x^3+1)^2 is 18((4x^9)/9+(2x^6)/3+(x^3)/3)+C

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integral of 18x^2(2x^3+1)^2

\int 18 x^{2} (2 x^{3} + 1)^{2} d x

18 (\frac{4 x ^{9}}{9} + \frac{2 x ^{6}}{3} + \frac{x ^{3}}{3}) + C

Solution steps

\int 18 x^{2} (2 x^{3} + 1)^{2} d x

Take the constant out:

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

= 18 \cdot \int x^{2} (2 x^{3} + 1)^{2} d x

Expand

x^{2} (2 x^{3} + 1)^{2} : 4 x^{8} + 4 x^{5} + x^{2}

= 18 \cdot \int 4 x^{8} + 4 x^{5} + 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

= 18 (\int 4 x^{8} d x + \int 4 x^{5} d x + \int x^{2} d x)

\int 4 x^{8} d x = \frac{4 x ^{9}}{9}

\int 4 x^{5} d x = \frac{2 x ^{6}}{3}

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

= 18 (\frac{4 x ^{9}}{9} + \frac{2 x ^{6}}{3} + \frac{x ^{3}}{3})

Add a constant to the solution

= 18 (\frac{4 x ^{9}}{9} + \frac{2 x ^{6}}{3} + \frac{x ^{3}}{3}) + C

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What is the integral of 18x^2(2x^3+1)^2 ?
The integral of 18x^2(2x^3+1)^2 is 18((4x^9)/9+(2x^6)/3+(x^3)/3)+C