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October 9th, 2007, 06:03 PM   #1
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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.
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October 10th, 2007, 04:56 PM   #2
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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.
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October 10th, 2007, 05:53 PM   #3
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Thanks mathman,

That did the trick
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