What is the integral of 4xsqrt(4x^2-1) ?

The integral of 4xsqrt(4x^2-1) is 1/3 (4x^2-1)^{3/2}+C

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integral of 4xsqrt(4x^2-1)

\int 4 x 4 x^{2} - 1 d x

\frac{1}{3} (4 x^{2} - 1)^{\frac{3}{2}} + C

Solution steps

\int 4 x 4 x^{2} - 1 d x

Take the constant out:

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

= 4 \cdot \int x 4 x^{2} - 1 d x

Apply u-substitution

: \int \frac{u}{8} d u

= 4 \cdot \int \frac{u}{8} d u

Take the constant out:

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

= 4 \cdot \frac{1}{8} \cdot \int u d u

Apply the Power Rule

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

= 4 \cdot \frac{1}{8} \cdot \frac{2}{3} u^{\frac{3}{2}}

Substitute back

u = 4 x^{2} - 1

= 4 \cdot \frac{1}{8} \cdot \frac{2}{3} (4 x^{2} - 1)^{\frac{3}{2}}

Simplify

4 \cdot \frac{1}{8} \cdot \frac{2}{3} (4 x^{2} - 1)^{\frac{3}{2}} : \frac{1}{3} (4 x^{2} - 1)^{\frac{3}{2}}

= \frac{1}{3} (4 x^{2} - 1)^{\frac{3}{2}}

Add a constant to the solution

= \frac{1}{3} (4 x^{2} - 1)^{\frac{3}{2}} + C

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What is the integral of 4xsqrt(4x^2-1) ?
The integral of 4xsqrt(4x^2-1) is 1/3 (4x^2-1)^{3/2}+C