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- Feb 21st 2008, 04:41 AM #1

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- Feb 21st 2008, 04:46 AM #2

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- Feb 21st 2008, 04:47 AM #3
I assume that you should expand the bracket.

If so there are 2 different ways to do it:

1. Re-write the square as a product and multiply using the distribution rule

2. All 4 terms belong to one binomial formula:

Plug in your terms and values into this formula and you'll get the result immediately.