`int x^2/(x-1) dx` Find the indefinite integral

Expert Answers

An illustration of the letter 'A' in a speech bubbles

`intx^2/(x-1)dx`

Rewrite the integral as ,

`intx^2/(x-1)dx=int(x^2-1+1)/(x-1)dx`

`=int((x^2-1)/(x-1)+1/(x-1))dx`

`=int(((x+1)(x-1))/(x-1)+1/(x-1))dx`

`=int(x+1+1/(x-1))dx`

apply the sum rule,

`=intxdx+int1dx+int1/(x-1)dx`

Apply the power rule and standard integralĀ `intdx/x=ln|x|`

`=(x^(1+1)/(1+1))+x+int1/(x-1)dx`

Apply integral substitution `u=(x-1)` forĀ `int1/(x-1)dx`

`du=dx`

`int1/(x-1)dx=int(du)/u`

`=ln(u)`

substitute back`u=(x-1)`,

`=ln|x-1|`

So the final integration and adding a constant C to the solution yields,

`=x^2/2+x+ln|x-1|+C`

See eNotes Ad-Free

Start your 48-hour free trial to get access to more than 30,000 additional guides and more than 350,000 Homework Help questions answered by our experts.

Get 48 Hours Free Access
Approved by eNotes Editorial