What is the integral of (4x)/(sqrt(2x+1)) ?

The integral of (4x)/(sqrt(2x+1)) is 2(1/3 (2x+1)^{3/2}-sqrt(2x+1))+C

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integral of (4x)/(sqrt(2x+1))

\int \frac{4 x}{2 x + 1} d x

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

Solution steps

\int \frac{4 x}{2 x + 1} d x

Take the constant out:

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

= 4 \cdot \int \frac{x}{2 x + 1} d x

Apply u-substitution

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

= 4 \cdot \int \frac{u ^{2} - 1}{2} d u

Take the constant out:

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

= 4 \cdot \frac{1}{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

= 4 \cdot \frac{1}{2} (\int u^{2} d u - \int 1 d u)

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

\int 1 d u = u

= 4 \cdot \frac{1}{2} (\frac{u ^{3}}{3} - u)

Substitute back

u = 2 x + 1

= 4 \cdot \frac{1}{2} (\frac{( 2 x + 1 ) ^{3}}{3} - 2 x + 1)

Simplify

4 \cdot \frac{1}{2} (\frac{( 2 x + 1 ) ^{3}}{3} - 2 x + 1) : 2 (\frac{1}{3} (2 x + 1)^{\frac{3}{2}} - 2 x + 1)

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

Add a constant to the solution

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

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What is the integral of (4x)/(sqrt(2x+1)) ?
The integral of (4x)/(sqrt(2x+1)) is 2(1/3 (2x+1)^{3/2}-sqrt(2x+1))+C