What is the integral of 6x*sqrt(x^2+4) ?

The integral of 6x*sqrt(x^2+4) is 2(x^2+4)^{3/2}+C

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integral of 6x*sqrt(x^2+4)

\int 6 x \cdot x^{2} + 4 d x

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

Solution steps

\int 6 x x^{2} + 4 d x

Take the constant out:

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

= 6 \cdot \int x x^{2} + 4 d x

Apply u-substitution

= 6 \cdot \int u^{2} d u

Apply the Power Rule

= 6 \cdot \frac{u ^{3}}{3}

Substitute back

u = x^{2} + 4

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

Simplify

6 \cdot \frac{( x ^{2} + 4 ) ^{3}}{3} : 2 (x^{2} + 4)^{\frac{3}{2}}

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

Add a constant to the solution

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

What is the integral of 6x*sqrt(x^2+4) ?
The integral of 6x*sqrt(x^2+4) is 2(x^2+4)^{3/2}+C