What is the integral from 5 to 9 of 1/(sqrt(9-x)) ?

The integral from 5 to 9 of 1/(sqrt(9-x)) is 4

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integral from 5 to 9 of 1/(sqrt(9-x))

\int_{5}^{9} \frac{1}{9 - x} d x

4

Solution steps

\int_{5}^{9} \frac{1}{9 - x} d x

Apply u-substitution

: \int_{4}^{0} - \frac{1}{u} d u

= \int_{4}^{0} - \frac{1}{u} d u

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

= - \int_{0}^{4} - \frac{1}{u} d u

Take the constant out:

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

= - (- \int_{0}^{4} \frac{1}{u} d u)

Apply the Power Rule

: [2 u^{\frac{1}{2}}]_{0}^{4}

= - (- [2 u^{\frac{1}{2}}]_{0}^{4})

Simplify

- (- [2 u^{\frac{1}{2}}]_{0}^{4}) : [2 u]_{0}^{4}

= [2 u]_{0}^{4}

Compute the boundaries:

4

= 4

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What is the integral from 5 to 9 of 1/(sqrt(9-x)) ?
The integral from 5 to 9 of 1/(sqrt(9-x)) is 4