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Topic: Help in two questions, please
Replies: 9   Last Post: Jan 31, 2012 8:48 AM

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brahmi

Posts: 1
From: tunisia
Registered: 7/18/10
Re: Help in two questions, please
Posted: Jul 18, 2010 9:55 AM
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hi there,concerning your Q1 :
we have :
(x+y)^2=x^2+y^2+2xy
thus,4=8+2xy so xy=-2
same idea for b)!!
that's one method there might be other proofs.
Q2
don't waste too much time trying to figure out the pattern because there is none.



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