Qualification > Math

C1 Edexcel Jan2010 Question! Please help!

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Blizz_rb93:

--- Quote from: Angel. on April 21, 2010, 05:46:42 pm ---No problem :D

I got that by completing the square.
In the case above, you have x^2 + 4kx and you know that it will end up looking something like (x + ...)^2 + constant. When you complete the square, you have to halve the b value (which in this case is 4k) so that that can go in the bracket. Then you get (x + 2k)^2 although that will give you an extra 4k^2 when you expand the bracket. Therefore you need to minus 4k^2 from this and you end up getting (x + 2k)^2 - 4k^2.

I'm sorry if that's an awful explanation, but I can't really explain it through words properly. If my reasoning makes no sense, you can Google 'completing the square', although I'm sure that you probably know how to do it ;)

--- End quote ---

sorry for late replies lol, i was eating a while ago and i was using the phone

anyways thank you for your explanation!! you helped me out alot on a)

I already know how to do (b) and right now im gonna read part (c) and see if it helps :)

thank you very much, ill give u rep

Angel.:
No problem! I'm glad that I could help and thank you for the rep! I only joined these forums yesterday, so I really appreciate it! :)

Good luck with part (c)! :D

Blizz_rb93:
Thank you very much in total :) you helped me out alot :D

Angel.:
Aww, honestly it was no problem. :)

Amr Fouad:
Thanks Angel

+rep

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