LinkBack URL
About LinkBacks
if\,dx=2(x+1)\,dx.)
Hi, while working on some integration problems today, I came across this one:
I multiplied it out:
(Edit: it's supposed to say x^2+2x in the first term)
And with some trial and error I got an answer:
When I differentiate this I get back what I started out with.
But trial and error isn't usually the best way to get an answer, so can anyone tell me which steps I need to take here?
Should I be using U-substitution?
Originally Posted by TwoPlusTwo
Hi, while working on some integration problems today, I came across this one:
I multiplied it out:
(Edit: it's supposed to say x^2+2x in the first term)
And with some trial and error I got an answer:
When I differentiate this I get back what I started out with.
But trial and error isn't usually the best way to get an answer, so can anyone tell me which steps I need to take here?
Should I be using U-substitution?
You can do that, or else you can notice thatis half the derivative of
, so you can write
and then use the almost-immediate integral
Tonio
  |
