What is the integral of (sqrt(x+3))/(x+2) ?

The integral of (sqrt(x+3))/(x+2) is -ln|sqrt(x+3)+1|+ln|sqrt(x+3)-1|+2sqrt(x+3)+C

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integral of (sqrt(x+3))/(x+2)

\int \frac{x + 3}{x + 2} d x

- ln x + 3 + 1 + ln x + 3 - 1 + 2 x + 3 + C

Solution steps

\int \frac{x + 3}{x + 2} d x

Apply u-substitution

: \int \frac{2 u ^{2}}{u ^{2} - 1} d u

= \int \frac{2 u ^{2}}{u ^{2} - 1} d u

Take the constant out:

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

= 2 \cdot \int \frac{u ^{2}}{u ^{2} - 1} d u

Factor

u^{2} - 1 : - (- u^{2} + 1)

= 2 \cdot \int \frac{u ^{2}}{- ( - u ^{2} + 1 )} d u

Take the constant out:

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

= 2 (- \int \frac{u ^{2}}{- u ^{2} + 1} d u)

\frac{u ^{2}}{- u ^{2} + 1} = \frac{1}{- u ^{2} + 1} - 1

= 2 (- \int \frac{1}{- u ^{2} + 1} - 1 d u)

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 \frac{1}{- u ^{2} + 1} d u - \int 1 d u))

\int \frac{1}{- u ^{2} + 1} d u = \frac{ln ∣ u + 1 ∣}{2} - \frac{ln ∣ u - 1 ∣}{2}

\int 1 d u = u

= 2 (- (\frac{ln ∣ u + 1 ∣}{2} - \frac{ln ∣ u - 1 ∣}{2} - u))

Substitute back

u = x + 3

= 2 (- (\frac{ln x + 3 + 1}{2} - \frac{ln x + 3 - 1}{2} - x + 3))

Simplify

2 (- (\frac{ln x + 3 + 1}{2} - \frac{ln x + 3 - 1}{2} - x + 3)) : - ln x + 3 + 1 + ln x + 3 - 1 + 2 x + 3

= - ln x + 3 + 1 + ln x + 3 - 1 + 2 x + 3

Add a constant to the solution

= - ln x + 3 + 1 + ln x + 3 - 1 + 2 x + 3 + C

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What is the integral of (sqrt(x+3))/(x+2) ?
The integral of (sqrt(x+3))/(x+2) is -ln|sqrt(x+3)+1|+ln|sqrt(x+3)-1|+2sqrt(x+3)+C