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ReiAyanami580
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 Posted: Tue Feb 07, 2006 6:36 am Post subject: Anyone can help me solve this question |
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Given that f(x)=x^19+2x^18+3x^17+......+19x+20,g(x)=20x^19+19x^18+.......+2x+1.Find the coefficient of x^18 in f(x)g(x)
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pyrorecca
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| Posted: Tue Feb 07, 2006 7:09 am Post subject: |
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2490
I think...I assume...Yeah.....square numbers 2-19.add all of em up and add 1 and 20....
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kimio
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| Posted: Tue Feb 07, 2006 1:32 pm Post subject: |
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| gantz is the result |
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logs
The Infamous Samurai
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| Posted: Tue Feb 07, 2006 1:43 pm Post subject: |
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its not that hard to solve... but they way you wrote it really confused me abit
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ReiAyanami580
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| Posted: Tue Feb 07, 2006 10:52 pm Post subject: |
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It is a polynormial question.....(^stand for power of)
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-Kai-
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Joined: Feb 04, 2006
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| Posted: Wed Feb 08, 2006 1:46 am Post subject: |
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| huh? |
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joekool
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| Posted: Thu Feb 09, 2006 8:40 am Post subject: |
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| sounds like you wanna be 'deus ex machina' ... |
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sadakuro
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| Posted: Thu Feb 09, 2006 9:19 am Post subject: |
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That's why I hate maths. I never think in seeing it here. Danm you Baldor
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Si puedes leer esto, entonces te invito a que visites mi blog http://juankmu.blogspot.com
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Jsy3k
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| Posted: Thu Feb 09, 2006 8:29 pm Post subject: |
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| pyrorecca wrote: |
2490
I think...I assume...Yeah.....square numbers 2-19.add all of em up and add 1 and 20.... |
Pyro, it is not square of each number. Since it is f(x)g(x), both equations are multiplied, so if you want to get coefficient of x^18, you need combination of (x^0;x^18), (x;x^17), (x^2;x^16), etc.
If you multiply both the equation, coefficient of x^18 is [ (2 x 1) + (3 x 2) + (4 x 3) + (5 x 4) + ..... + (20 x 19) ]
Which total up to 2660. I count this one by one throughout. I can't seem to find one equation that can generalise the equation.
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adam_askew
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Joined: Jun 18, 2005
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| Posted: Thu Feb 09, 2006 8:32 pm Post subject: |
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The answer is fourty-two.... to the power of Johnny Cash. Because 42 is the answer to the meaning of life. And johny cash is everything.
(if you get that johnny cash joke you like stephen king too much) |
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Jsy3k
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| Posted: Thu Feb 09, 2006 8:41 pm Post subject: |
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| adam_askew wrote: |
The answer is fourty-two.... to the power of Johnny Cash. Because 42 is the answer to the meaning of life. And johny cash is everything.
(if you get that johnny cash joke you like stephen king too much) |
.....
If you do not wish to help solve the problem, then do not even bother posting anything.
This is mathematics and 42^johnny cash is not a logical answer. And no, mathematics got nothing to do with the meaning of life. If math has something to do with the meaning of life, please show me proof with equations and detailed explanation in terms of numbers and equations of how you derived that answer.
If you can't, then buzz off and post in something that you have logical answer to.
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pyrorecca
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Joined: Sep 03, 2005
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| Posted: Sat Feb 11, 2006 8:53 am Post subject: |
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Damn........ my mental sums is really pathetic these days......I really need to write things down......
All my teachers are busting on me for being lazy, sloppy etc etc.
My maths teacher gave me extra hw  . She thinks I'm gifted.....But really all I do is look for the easiest way to solve a qn in teh shortest time possible.
Soooo.......any more qns?
I'll start one......An easy one. Whats the units digit of 9^345?
Ans:9
I'm lazy alrite!!! Sheesh....I'm so not gonna come up with my own qns......
Kimio>I agree. Gantz is the answer to everything
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adam_askew
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Joined: Jun 18, 2005
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| Posted: Sat Feb 11, 2006 2:25 pm Post subject: |
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| Quote: |
If you do not wish to help solve the problem, then do not even bother posting anything.
This is mathematics and 42^johnny cash is not a logical answer. And no, mathematics got nothing to do with the meaning of life. If math has something to do with the meaning of life, please show me proof with equations and detailed explanation in terms of numbers and equations of how you derived that answer.
If you can't, then buzz off and post in something that you have logical answer to. |
Oh, a stab to your poor narrators heart, such cold slovos thrown at one such as I. It stands to reason and i won't have it. |
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pyrorecca
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Joined: Sep 03, 2005
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| Posted: Sun Feb 12, 2006 12:13 am Post subject: |
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Wuh Oh.....I think some one has read A Clockwork Orange one too many times.
Its a good book though. I like it.
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