What is the integral from 4 to 9 of 1/(8-sqrt(x)) ?

The integral from 4 to 9 of 1/(8-sqrt(x)) is 2(-1+8(ln(6)-ln(5)))

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integral from 4 to 9 of 1/(8-sqrt(x))

\int_{4}^{9} \frac{1}{8 - x} d x

2 (- 1 + 8 (ln (6) - ln (5)))

Decimal

0.91714 \dots

Solution steps

\int_{4}^{9} \frac{1}{8 - x} d x

Apply u-substitution

: \int_{2}^{3} \frac{2 u}{8 - u} d u

= \int_{2}^{3} \frac{2 u}{8 - u} d u

Take the constant out:

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

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

Apply u-substitution

: \int_{6}^{5} - \frac{- v + 8}{v} d v

= 2 \cdot \int_{6}^{5} - \frac{- v + 8}{v} d v

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

= 2 (- \int_{5}^{6} - \frac{- v + 8}{v} d v)

Take the constant out:

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

= 2 (- (- \int_{5}^{6} \frac{- v + 8}{v} d v))

Expand

\frac{- v + 8}{v} : - 1 + \frac{8}{v}

= 2 (- (- \int_{5}^{6} - 1 + \frac{8}{v} d v))

Apply the Sum Rule:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

= 2 (- (- (- \int_{5}^{6} 1 d v + \int_{5}^{6} \frac{8}{v} d v)))

\int_{5}^{6} 1 d v = 1

\int_{5}^{6} \frac{8}{v} d v = 8 (ln (6) - ln (5))

= 2 (- (- (- 1 + 8 (ln (6) - ln (5)))))

Simplify

= 2 (- 1 + 8 (ln (6) - ln (5)))

\int e^{- x t} d x

\frac{d}{d x} (3 ln (x) + ln (y))

(1, 3), (- 2, - 3)

\frac{\partial}{\partial y} (e^{x^{2} + y})

\frac{d y}{d t} = 8 y, y (4) = 4

What is the integral from 4 to 9 of 1/(8-sqrt(x)) ?
The integral from 4 to 9 of 1/(8-sqrt(x)) is 2(-1+8(ln(6)-ln(5)))