What is the integral of (x+3)sqrt(8-x) ?

The integral of (x+3)sqrt(8-x) is 2/5 (8-x)^{5/2}-22/3 (8-x)^{3/2}+C

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integral of (x+3)sqrt(8-x)

\int (x + 3) 8 - x d x

\frac{2}{5} (8 - x)^{\frac{5}{2}} - \frac{22}{3} (8 - x)^{\frac{3}{2}} + C

Solution steps

\int (x + 3) 8 - x d x

Apply u-substitution

: \int - u (- u + 11) d u

= \int - u (- u + 11) d u

Take the constant out:

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

= - \int u (- u + 11) d u

Expand

u (- u + 11) : - u^{\frac{3}{2}} + 11 u

= - \int - u^{\frac{3}{2}} + 11 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

= - (- \int u^{\frac{3}{2}} d u + \int 11 u d u)

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

\int 11 u d u = \frac{22}{3} u^{\frac{3}{2}}

= - (- \frac{2}{5} u^{\frac{5}{2}} + \frac{22}{3} u^{\frac{3}{2}})

Substitute back

u = 8 - x

= - (- \frac{2}{5} (8 - x)^{\frac{5}{2}} + \frac{22}{3} (8 - x)^{\frac{3}{2}})

Simplify

= \frac{2}{5} (8 - x)^{\frac{5}{2}} - \frac{22}{3} (8 - x)^{\frac{3}{2}}

Add a constant to the solution

= \frac{2}{5} (8 - x)^{\frac{5}{2}} - \frac{22}{3} (8 - x)^{\frac{3}{2}} + C

2 x + \frac{5}{x}

\frac{d}{d x} (cos (x) - cos^{2} (x))

\frac{d}{d x} (x^{3} + 3 x^{2})

\int_{0}^{1} (x^{e} + e^{x}) d x

x^{10} h (x)

What is the integral of (x+3)sqrt(8-x) ?
The integral of (x+3)sqrt(8-x) is 2/5 (8-x)^{5/2}-22/3 (8-x)^{3/2}+C