What is the integral of 20xsqrt(10x+2) ?

The integral of 20xsqrt(10x+2) is 1/75 (6(10x+2)^{5/2}-20(10x+2)^{3/2})+C

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integral of 20xsqrt(10x+2)

\int 20 x 10 x + 2 d x

\frac{1}{75} (6 (10 x + 2)^{\frac{5}{2}} - 20 (10 x + 2)^{\frac{3}{2}}) + C

Solution steps

\int 20 x 10 x + 2 d x

Take the constant out:

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

= 20 \cdot \int x 10 x + 2 d x

Apply u-substitution

: \int \frac{u ( u - 2 )}{100} d u

= 20 \cdot \int \frac{u ( u - 2 )}{100} d u

Take the constant out:

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

= 20 \cdot \frac{1}{100} \cdot \int u (u - 2) d u

Expand

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

= 20 \cdot \frac{1}{100} \cdot \int u^{\frac{3}{2}} - 2 u 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

= 20 \cdot \frac{1}{100} (\int u^{\frac{3}{2}} d u - \int 2 u d u)

\int u^{\frac{3}{2}} d u = \frac{2}{5} u^{\frac{5}{2}}

\int 2 u d u = \frac{4}{3} u^{\frac{3}{2}}

= 20 \cdot \frac{1}{100} (\frac{2}{5} u^{\frac{5}{2}} - \frac{4}{3} u^{\frac{3}{2}})

Substitute back

u = 10 x + 2

= 20 \cdot \frac{1}{100} (\frac{2}{5} (10 x + 2)^{\frac{5}{2}} - \frac{4}{3} (10 x + 2)^{\frac{3}{2}})

Simplify

20 \cdot \frac{1}{100} (\frac{2}{5} (10 x + 2)^{\frac{5}{2}} - \frac{4}{3} (10 x + 2)^{\frac{3}{2}}) : \frac{1}{75} (6 (10 x + 2)^{\frac{5}{2}} - 20 (10 x + 2)^{\frac{3}{2}})

= \frac{1}{75} (6 (10 x + 2)^{\frac{5}{2}} - 20 (10 x + 2)^{\frac{3}{2}})

Add a constant to the solution

= \frac{1}{75} (6 (10 x + 2)^{\frac{5}{2}} - 20 (10 x + 2)^{\frac{3}{2}}) + C

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What is the integral of 20xsqrt(10x+2) ?
The integral of 20xsqrt(10x+2) is 1/75 (6(10x+2)^{5/2}-20(10x+2)^{3/2})+C