What is the integral from 0 to 3 of x/(sqrt(9-x^2)) ?

The integral from 0 to 3 of x/(sqrt(9-x^2)) is 3

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integral from 0 to 3 of x/(sqrt(9-x^2))

\int_{0}^{3} \frac{x}{9 - x ^{2}} d x

3

Solution steps

\int_{0}^{3} \frac{x}{9 - x ^{2}} d x

Apply u-substitution

: \int_{9}^{0} - \frac{1}{2 u} d u

= \int_{9}^{0} - \frac{1}{2 u} d u

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

= - \int_{0}^{9} - \frac{1}{2 u} 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}^{9} \frac{1}{u} d u)

Apply the Power Rule

: [2 u^{\frac{1}{2}}]_{0}^{9}

= - (- \frac{1}{2} [2 u^{\frac{1}{2}}]_{0}^{9})

Simplify

- (- \frac{1}{2} [2 u^{\frac{1}{2}}]_{0}^{9}) : \frac{1}{2} [2 u]_{0}^{9}

= \frac{1}{2} [2 u]_{0}^{9}

Compute the boundaries:

6

= \frac{1}{2} \cdot 6

Simplify

= 3

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What is the integral from 0 to 3 of x/(sqrt(9-x^2)) ?
The integral from 0 to 3 of x/(sqrt(9-x^2)) is 3