What is the integral of r^2((r^3)/9+7)^2 ?

The integral of r^2((r^3)/9+7)^2 is ((r^3)/9+7)^3+C

integral of r^2((r^3)/9+7)^2

\int r^{2} (\frac{r ^{3}}{9} + 7)^{2} d r

(\frac{r ^{3}}{9} + 7)^{3} + C

Solution steps

\int r^{2} (\frac{r ^{3}}{9} + 7)^{2} d r

Apply u-substitution

= \int 3 u^{2} d u

Take the constant out:

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

= 3 \cdot \int u^{2} d u

Apply the Power Rule

= 3 \cdot \frac{u ^{3}}{3}

Substitute back

u = \frac{r ^{3}}{9} + 7

= 3 \cdot \frac{( \frac{r ^{3}}{9} + 7 ) ^{3}}{3}

Simplify

3 \cdot \frac{( \frac{r ^{3}}{9} + 7 ) ^{3}}{3} : (\frac{r ^{3}}{9} + 7)^{3}

= (\frac{r ^{3}}{9} + 7)^{3}

Add a constant to the solution

= (\frac{r ^{3}}{9} + 7)^{3} + C

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What is the integral of r^2((r^3)/9+7)^2 ?
The integral of r^2((r^3)/9+7)^2 is ((r^3)/9+7)^3+C