What is the integral of y/(sqrt(y+1)) ?

The integral of y/(sqrt(y+1)) is 2(1/3 (y+1)^{3/2}-sqrt(y+1))+C

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integral of y/(sqrt(y+1))

\int \frac{y}{y + 1} d y

2 (\frac{1}{3} (y + 1)^{\frac{3}{2}} - y + 1) + C

Solution steps

\int \frac{y}{y + 1} d y

Apply u-substitution

: \int 2 (u^{2} - 1) d u

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

\int u^{2} d u = \frac{u ^{3}}{3}

\int 1 d u = u

= 2 (\frac{u ^{3}}{3} - u)

Substitute back

u = y + 1

= 2 (\frac{( y + 1 ) ^{3}}{3} - y + 1)

Simplify

2 (\frac{( y + 1 ) ^{3}}{3} - y + 1) : 2 (\frac{1}{3} (y + 1)^{\frac{3}{2}} - y + 1)

= 2 (\frac{1}{3} (y + 1)^{\frac{3}{2}} - y + 1)

Add a constant to the solution

= 2 (\frac{1}{3} (y + 1)^{\frac{3}{2}} - y + 1) + C

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What is the integral of y/(sqrt(y+1)) ?
The integral of y/(sqrt(y+1)) is 2(1/3 (y+1)^{3/2}-sqrt(y+1))+C