any calculus guru??

[leishi85]

doing my calc hw, and i;m completely stuck need some help

how do you put this function f(x)=3/(x^2+x-2) as the sum of a power series?

thanks in advance.

[Nomad]

If I remember, moninn is pretty good at it.

[leishi85]

come on marc, get in here.

[mmonnin]

Whoa, never done that but I will bust out the calc book.

[Gargoyle]

I took 4 semesters of calc, and I can't remember what a "sum of a power series" is. Sorry man :(

[primesuspect]

sounds like a giant robot anime:

"SUM TO POWER SERIES NO NAZU"

[mmonnin]

I have no idea.

All I can see is doing it like this:
http://mathforum.org/library/drmath/view/56934.html

Diviiding it all out. My book has the first example.

[qparadox]

The method mmonin shows is probably what they want you to do if you haven't learned any formal series expansions yet.

I get the following:

-3/2-3/4*x-9/8*x^2-15/16*x^3-33/32*x^4-63/64*x^5+ ....


but I suck at dividing .. so don't take that as the absolute answer ..

[shwaip]

I got the same as you q...I think this should be the answer in cool summation notation.

[qparadox]

you used maple didn't you? :P cheater :D

[leishi85]

yeah, cheater, i think i kind of got it.

[shwaip]

I used maple to make the pic. did the division and etc by hand. bitches.

[qparadox]

haha :)

[McBain]

wtf is maple?

[pseudonym]

Agreed. What is this program that could have done my work for me a few years ago.

God bless the Ti-89

[leishi85]

too bad we can't use calculators on exams or quiz or basically anything for my class.

[Gargoyle]

My TI-89 saved my butt so many times. I had the hardest time remembering rules of integration and differentitation, but the calculator never forgot :D

[mmonnin]

Yeah the Ti is a beast.