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October 9th, 2007, 05:03 PM  #1 
Newbie Joined: Oct 2007 Posts: 3 Thanks: 0  converting quadratic expression to a different expression
I am trying to figure out how to convert the equation: q / (p ± sqrt(p^2 + q)) to p ± sqrt(p^2 + q) I was told by a classmate that to do this I have to multiply the top and the bottom by p + sqrt(p^2 + q). The minus/plus is the key. I don't know how to use the minus/plus method to cancel out the plus/minus. Could someone help me out on this? Even show me a simple example of the process. Thanks for any help I can get. 
October 10th, 2007, 03:56 PM  #2 
Global Moderator Joined: May 2007 Posts: 6,306 Thanks: 525 
To get the hang of it, do the + and  seperately. This means multiply the term with plus by a term with  and then the other way around. You should see right away what's going on.

October 10th, 2007, 04:53 PM  #3 
Newbie Joined: Oct 2007 Posts: 3 Thanks: 0 
Thanks mathman, That did the trick 

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converting, expression, quadratic 
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