What is the integral of x(3x^2+9)^5 ?

The integral of x(3x^2+9)^5 is 1/36 (3x^2+9)^6+C

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integral of x(3x^2+9)^5

\int x (3 x^{2} + 9)^{5} d x

\frac{1}{36} (3 x^{2} + 9)^{6} + C

Solution steps

\int x (3 x^{2} + 9)^{5} d x

Apply u-substitution

= \int \frac{u ^{5}}{6} d u

Take the constant out:

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

= \frac{1}{6} \cdot \int u^{5} d u

Apply the Power Rule

= \frac{1}{6} \cdot \frac{u ^{6}}{6}

Substitute back

u = 3 x^{2} + 9

= \frac{1}{6} \cdot \frac{( 3 x ^{2} + 9 ) ^{6}}{6}

Simplify

\frac{1}{6} \cdot \frac{( 3 x ^{2} + 9 ) ^{6}}{6} : \frac{1}{36} (3 x^{2} + 9)^{6}

= \frac{1}{36} (3 x^{2} + 9)^{6}

Add a constant to the solution

= \frac{1}{36} (3 x^{2} + 9)^{6} + C

What is the integral of x(3x^2+9)^5 ?
The integral of x(3x^2+9)^5 is 1/36 (3x^2+9)^6+C