What is the integral of (x^2)/(8+x) ?

The integral of (x^2)/(8+x) is ((8+x)^2)/2-16(8+x)+64ln|8+x|+C

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integral of (x^2)/(8+x)

\int \frac{x ^{2}}{8 + x} d x

\frac{( 8 + x ) ^{2}}{2} - 16 (8 + x) + 64 ln ∣ 8 + x ∣ + C

Solution steps

\int \frac{x ^{2}}{8 + x} d x

Apply u-substitution

: \int \frac{( u - 8 ) ^{2}}{u} d u

= \int \frac{( u - 8 ) ^{2}}{u} d u

Expand

\frac{( u - 8 ) ^{2}}{u} : u - 16 + \frac{64}{u}

= \int u - 16 + \frac{64}{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 d u - \int 16 d u + \int \frac{64}{u} d u

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

\int 16 d u = 16 u

\int \frac{64}{u} d u = 64 ln ∣ u ∣

= \frac{u ^{2}}{2} - 16 u + 64 ln ∣ u ∣

Substitute back

u = 8 + x

= \frac{( 8 + x ) ^{2}}{2} - 16 (8 + x) + 64 ln ∣ 8 + x ∣

Add a constant to the solution

= \frac{( 8 + x ) ^{2}}{2} - 16 (8 + x) + 64 ln ∣ 8 + x ∣ + C

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What is the integral of (x^2)/(8+x) ?
The integral of (x^2)/(8+x) is ((8+x)^2)/2-16(8+x)+64ln|8+x|+C