My Math Forum converting quadratic expression to a different expression

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 October 9th, 2007, 06:03 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, 04:56 PM #2 Global Moderator   Joined: May 2007 Posts: 6,665 Thanks: 651 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, 05:53 PM #3 Newbie   Joined: Oct 2007 Posts: 3 Thanks: 0 Thanks mathman, That did the trick

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