What is the integral of (2x+6)^3 ?

The integral of (2x+6)^3 is 1/8 (2x+6)^4+C

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integral of (2x+6)^3

\int (2 x + 6)^{3} d x

\frac{1}{8} (2 x + 6)^{4} + C

Solution steps

\int (2 x + 6)^{3} d x

Apply u-substitution

: \int \frac{u ^{3}}{2} d u

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

Take the constant out:

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

= \frac{1}{2} \cdot \int u^{3} d u

Apply the Power Rule

: \frac{u ^{4}}{4}

= \frac{1}{2} \cdot \frac{u ^{4}}{4}

Substitute back

u = 2 x + 6

= \frac{1}{2} \cdot \frac{( 2 x + 6 ) ^{4}}{4}

Simplify

\frac{1}{2} \cdot \frac{( 2 x + 6 ) ^{4}}{4} : \frac{1}{8} (2 x + 6)^{4}

= \frac{1}{8} (2 x + 6)^{4}

Add a constant to the solution

= \frac{1}{8} (2 x + 6)^{4} + C

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