What is the integral of xsqrt(9-4x^2) ?

The integral of xsqrt(9-4x^2) is -1/12 (9-4x^2)^{3/2}+C

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integral of xsqrt(9-4x^2)

\int x 9 - 4 x^{2} d x

- \frac{1}{12} (9 - 4 x^{2})^{\frac{3}{2}} + C

Solution steps

\int x 9 - 4 x^{2} d x

Apply u-substitution

= \int - \frac{u}{8} d u

Take the constant out:

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

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

Apply the Power Rule

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

Substitute back

u = 9 - 4 x^{2}

= - \frac{1}{8} \cdot \frac{2}{3} (9 - 4 x^{2})^{\frac{3}{2}}

Simplify

- \frac{1}{8} \cdot \frac{2}{3} (9 - 4 x^{2})^{\frac{3}{2}} : - \frac{1}{12} (9 - 4 x^{2})^{\frac{3}{2}}

= - \frac{1}{12} (9 - 4 x^{2})^{\frac{3}{2}}

Add a constant to the solution

= - \frac{1}{12} (9 - 4 x^{2})^{\frac{3}{2}} + C

What is the integral of xsqrt(9-4x^2) ?
The integral of xsqrt(9-4x^2) is -1/12 (9-4x^2)^{3/2}+C