exam on wednesday for maths, need help on a question

[jasonchiu]

hey simple ass for u guys, here it is

"rearrange x^2-20x+500

in the form

(x-p)^2+q

thanks

jason

[MadMax]

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.

[jasonchiu]

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

[MXM]

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

[jasonchiu]

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]

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

[jasonchiu]

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

[SiR_dude]

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

Full of tact, aren't we??

[jensked]

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

[jasonchiu]

yes please

[MXM]

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


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