# Indefinite integral help...

by uman
Tags: indefinite, integral
 P: 352 How can I evaluate $\int\frac{dx}{\sqrt{1-2x-x^2}}$ using inverse trig functions? Thanks.
 HW Helper P: 6,191 complete the square of the quadratic.
 P: 352 Oh... thanks. Dang these are so hard... I wish I had the creativity to see the solution immediately like that...
P: 1,757

## Indefinite integral help...

ax^2+bx+c, a=1, factor out the negative before you complete the square if you didn't remember.
 P: 352 Thanks. I got the right answer after rock.freak667's hint. I just wish I were able to solve these more easily, without hints from this forum and elsewhere.... does it just take lots of practice, or what?
 P: 1,757 Read read read! And do the practice problems :-] Go here to see a variety of diff. methods. http://www.mathlinks.ro/weblog_entry...=992552#992552 http://www.mathlinks.ro/weblog_entry...=992575#992575 http://www.mathlinks.ro/weblog_entry...=992703#992703
 HW Helper P: 3,353 When it comes to integrals, its experience that really counts. Do as many integrals as you can, you'll soon learn the tricks of the trade.

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