What is the integral from 0 to 6 of xsqrt(36-x^2) ?

The integral from 0 to 6 of xsqrt(36-x^2) is 72

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integral from 0 to 6 of xsqrt(36-x^2)

\int_{0}^{6} x 36 - x^{2} d x

72

Solution steps

\int_{0}^{6} x 36 - x^{2} d x

Apply u-substitution

= \int_{36}^{0} - \frac{u}{2} d u

\int_{a}^{b} f (x) d x = - \int_{b}^{a} f (x) d x, a < b

= - \int_{0}^{36} - \frac{u}{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_{0}^{36} u d u)

Apply the Power Rule

= - (- \frac{1}{2} [\frac{2}{3} u^{\frac{3}{2}}]_{0}^{36})

Simplify

= \frac{1}{2} [\frac{2}{3} u^{\frac{3}{2}}]_{0}^{36}

Compute the boundaries:

144

= \frac{1}{2} \cdot 144

Simplify

= 72

What is the integral from 0 to 6 of xsqrt(36-x^2) ?
The integral from 0 to 6 of xsqrt(36-x^2) is 72