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

The integral of (x^2)/((1+x)) is ((1+x)^2)/2-2(1+x)+ln|1+x|+C

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

integral of (x^2)/((1+x))

\int \frac{x ^{2}}{( 1 + x )} d x

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

Solution steps

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

Apply u-substitution

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

Expand

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

= \int u - 2 + \frac{1}{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 2 d u + \int \frac{1}{u} d u

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

\int 2 d u = 2 u

\int \frac{1}{u} d u = ln ∣ u ∣

= \frac{u ^{2}}{2} - 2 u + ln ∣ u ∣

Substitute back

u = 1 + x

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

Add a constant to the solution

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

\int \frac{2 ln ( x ^{2} )}{x} d x

\int 5 x sec^{2} (3 x) d x

\int sin^{3} (5 x) cos^{4} (5 x) d x

\int (x^{2} - 2 x) e^{x} d x

\int 1 - 2 x^{2} d x

What is the integral of (x^2)/((1+x)) ?
The integral of (x^2)/((1+x)) is ((1+x)^2)/2-2(1+x)+ln|1+x|+C