differential eqn.. help!
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okay here's the problem:
x + y + 1 + ( -x + y - 3 ) (dy/dx) = 0
find the general soln.
such a qn needs to be approached by substituition. but ive tried using v = x+y and v = -x+y but it doesnt work.
help, any maths pro?
thanks!!! -
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there is a maths forum by coolmyth...
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link?
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I'm just giving a shot, but if x = -x+y then wouldn't 2x = y? THen you can sub the 2x=y into the equation and see if it helps...Originally posted by papercut87:okay here's the problem:
x + y + 1 + ( -x + y - 3 ) (dy/dx) = 0
find the general soln.
such a qn needs to be approached by substituition. but ive tried using v = x+y and x = -x+y but it doesnt work.
help, any maths pro?
thanks!!!
Sorry ah I maths very goondu one... -
Originally posted by papercut87:link?
i think he change his maths forum to Football manager forum liao.
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i gave back my algebra to lecturers nong nong ago
i dun even noe wad is x+y=z -
hee thanks polarsnake... but i realised i made a typo error.. supposed to be v = x+y..
but thanks for ur help gal..
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wahahha.. diao~Originally posted by Pitot:
i think he change his maths forum to Football manager forum liao.
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so you're here to +1 huh?Originally posted by bryanseb: get a life then. -
http://fm2007.sgforums.comOriginally posted by papercut87:wahahha.. diao~
u go see his forum the second page was all maths problems one. -
ROFL!Originally posted by Pitot: -
Maybe papercut can try to post there as well... see if coolmyth or any of the old timers there can help herOriginally posted by Pitot: -
lol... like that very out of point man
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Is this suppose to be a-maths?
just asking cause it doesn't seems like it to me. -
i think he is ur senior oso.. can try. but ur prob also solve already rite
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I try to help you by posting in another forum. I'll get back to you later?Originally posted by papercut87:lol... like that very out of point man -
you need to bring out the minus in the bracket first, before you dy dx.
then just use the 3 standard formulas can le... -
furb. its my maths tutorial qn. so i guess its uni work ba.
polarsnake.. thanks gal... owe u one..
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ok close thread.
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Sorry for invading thread. But there's this question I really dunno how to do too. And the math forum is kinda too inactive.
Question: The sum, Sn, of the first n terms of a sequence is given by Sn = pn + qn², where p and q are constants. Prove that the sequence is an arithmetic progression, and hence, find the first term and common difference.
Answer for first term and common difference is p+q and 2q. No matter how I do. My answer is p and q. Anyone who can help me? -
Here's the thread, chack back maybe after 5-10 mins
http://boards.ign.com/the_vestibule/b5296/134988383/p1/?1
"Can you rewrite that. I'm not entirely clear on what that's supposed to say. The way it's written now makes it seem like you could just group like terms, and I assume the dy/dx implies your statement is already derived and via implicit differentiation or something? I can't really understand it the way it's written, but if you can retype it in a better way I can probably help."
How do I reply? -
Sn = pn + qn^2
therefore,
S1 = p + q (first term)
S2 = 2p + 4q
S3 = 3p + 9q
...
1st term = p + q
2nd term = S2 - S1 = p + 3q
3rd term = S3 - S2 = p + 5q
notice that common difference is 2q
the first term is p + q -
maths geeks forum omg.
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No it's not a forum for maths geeks but rather, I created a thread titled 'maths geeks'Originally posted by Pitot:maths geeks forum omg.