What is the integral of 3(3x+4)^4 ?

The integral of 3(3x+4)^4 is 1/5 (3x+4)^5+C

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integral of 3(3x+4)^4

\int 3 (3 x + 4)^{4} d x

\frac{1}{5} (3 x + 4)^{5} + C

Solution steps

\int 3 (3 x + 4)^{4} d x

Take the constant out:

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

= 3 \cdot \int (3 x + 4)^{4} d x

Apply u-substitution

= 3 \cdot \int \frac{u ^{4}}{3} d u

Take the constant out:

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

= 3 \cdot \frac{1}{3} \cdot \int u^{4} d u

Apply the Power Rule

= 3 \cdot \frac{1}{3} \cdot \frac{u ^{5}}{5}

Substitute back

u = 3 x + 4

= 3 \cdot \frac{1}{3} \cdot \frac{( 3 x + 4 ) ^{5}}{5}

Simplify

3 \cdot \frac{1}{3} \cdot \frac{( 3 x + 4 ) ^{5}}{5} : \frac{1}{5} (3 x + 4)^{5}

= \frac{1}{5} (3 x + 4)^{5}

Add a constant to the solution

= \frac{1}{5} (3 x + 4)^{5} + C

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