exam on wednesday for maths, need help on a question

jasonchiu · May 14th, 2005, 10:53 AM

hey simple ass for u guys, here it is

"rearrange x^2-20x+500

in the form

(x-p)^2+q

thanks

jason

MadMax · May 14th, 2005, 11:30 AM

well, think about it.

Start with the (x-p)^2

Expanding that out you're going to get x^2 - 2p*x + p^2

Equate coefficients from one side to the other, and you can tell that p has to equal 10.

From there, you have that (x-10)^2 = x^2 -20x + 100

But you need 500 at the end, so obviously q has to be 400.

So... x^2 - 20x + 500 = (x-10)^2 + 400

Just think it through logically, and break it down into the simple things that you know how to do to begin with.

images/smilies/thumbsup.gif

jasonchiu · May 14th, 2005, 11:40 AM

could someone write it on paper and scan it or photo it? like without thex^2 but with x2 witha a little 2

MXM · May 14th, 2005, 12:10 PM

Just wirte what MadMax wrote on paper yourself and think about it. It's pretty straightforward.

Ok, here's a picture, should be pretty clear images/smilies/smile.gif

http://img132.echo.cx/img132/2185/math9rc.gif

jasonchiu · May 14th, 2005, 12:19 PM

THANKS SO MUCH!

btw as u know iam 17 and this question seems v simple for a 17yr old doin maths..

feel like tellin s story and stoping revison.

so i;m un 12 and we take AS levels. if ur normal u do 4, whcih i am. i use to take business, design, psychology and IT

however, lookin in to uni's, having maths is a major advantage if takin business.

however, when i was doin gcse's i got a B, which is good enough to take standard maths in AS level, however i took the intermediate paper where i u miss out some stuff which is important so they forced me to take a 2 years AS course which means while ppl end up wit ha A level in 2 years, i only get a AS.

but then having maths is adavantage so i guess it worth it.

Renesis · May 14th, 2005, 5:32 PM

Dude you suck, I stopped doing maths more than a year ago but that was easy

jasonchiu · May 14th, 2005, 5:33 PM

o thanks, i'll always look to u for postivite comment u ***

SiR_dude · May 14th, 2005, 6:14 PM

Quote:

Originally Posted by Renesis

Dude you suck, I stopped doing maths more than a year ago but that was easy

Full of tact, aren't we?? images/smilies/lol.gif

jensked · May 14th, 2005, 7:01 PM

Should we open a "do my homework for me"- topic?

jasonchiu · May 14th, 2005, 7:21 PM

yes please

MXM · May 14th, 2005, 10:31 PM

We have one about homework already, Josty (or not) started it a while ago.

EDIT: http://forum.finalgear.com/viewtopic.php?t=3108

May 14th, 2005, 10:53 AM	#1
jasonchiu Banned Joined: May 26th, 2004 Last Online: August 26th, 2005 Location: hong kong Posts: 5,216 Rep Power: 0	exam on wednesday for maths, need help on a question hey simple ass for u guys, here it is "rearrange x^2-20x+500 in the form (x-p)^2+q thanks jason

May 14th, 2005, 7:01 PM	#9
jensked Joined: Mar 31st, 2005 Last Online: Yesterday Location: Flanders, Belgium Age: 26 Posts: 4,056 Car: RIP Opel Astra -> 2006 Toyota Corolla Wagon Rep Power: 49	Should we open a "do my homework for me"- topic? __________________

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May 14th, 2005, 11:30 AM	#2
MadMax Joined: Apr 19th, 2005 Last Online: December 9th, 2007 Location: Adelaide, South Australia Posts: 52 Rep Power: 0	well, think about it. Start with the (x-p)^2 Expanding that out you're going to get x^2 - 2p*x + p^2 Equate coefficients from one side to the other, and you can tell that p has to equal 10. From there, you have that (x-10)^2 = x^2 -20x + 100 But you need 500 at the end, so obviously q has to be 400. So... x^2 - 20x + 500 = (x-10)^2 + 400 Just think it through logically, and break it down into the simple things that you know how to do to begin with.

May 14th, 2005, 11:40 AM	#3
jasonchiu Banned Joined: May 26th, 2004 Last Online: August 26th, 2005 Location: hong kong Posts: 5,216 Rep Power: 0	could someone write it on paper and scan it or photo it? like without thex^2 but with x2 witha a little 2

May 14th, 2005, 12:10 PM	#4
MXM old porsches do run! Joined: Jun 9th, 2004 Last Online: Yesterday Location: Finland Age: 27 Posts: 3,059 Car: 7, 944 LFS Status: Rep Power: 63	Just wirte what MadMax wrote on paper yourself and think about it. It's pretty straightforward. Ok, here's a picture, should be pretty clear

May 14th, 2005, 12:19 PM	#5
jasonchiu Banned Joined: May 26th, 2004 Last Online: August 26th, 2005 Location: hong kong Posts: 5,216 Rep Power: 0	THANKS SO MUCH! btw as u know iam 17 and this question seems v simple for a 17yr old doin maths.. feel like tellin s story and stoping revison. so i;m un 12 and we take AS levels. if ur normal u do 4, whcih i am. i use to take business, design, psychology and IT however, lookin in to uni's, having maths is a major advantage if takin business. however, when i was doin gcse's i got a B, which is good enough to take standard maths in AS level, however i took the intermediate paper where i u miss out some stuff which is important so they forced me to take a 2 years AS course which means while ppl end up wit ha A level in 2 years, i only get a AS. but then having maths is adavantage so i guess it worth it.

May 14th, 2005, 5:32 PM	#6
Renesis Lazier than Viper Joined: Nov 27th, 2003 Last Online: November 16th, 2009 Location: Quebec, Canada Age: 22 Posts: 9,669 Car: 2007 Pontiac G5 GT LFS Status: Rep Power: 34	Dude you suck, I stopped doing maths more than a year ago but that was easy

May 14th, 2005, 5:33 PM	#7
jasonchiu Banned Joined: May 26th, 2004 Last Online: August 26th, 2005 Location: hong kong Posts: 5,216 Rep Power: 0	o thanks, i'll always look to u for postivite comment u ***

May 14th, 2005, 7:21 PM	#10
jasonchiu Banned Joined: May 26th, 2004 Last Online: August 26th, 2005 Location: hong kong Posts: 5,216 Rep Power: 0	yes please

May 14th, 2005, 10:31 PM	#11
MXM old porsches do run! Joined: Jun 9th, 2004 Last Online: Yesterday Location: Finland Age: 27 Posts: 3,059 Car: 7, 944 LFS Status: Rep Power: 63	We have one about homework already, Josty (or not) started it a while ago. EDIT: http://forum.finalgear.com/viewtopic.php?t=3108

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