I am not sure how to solve this. Help please?

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- February 5th 2009, 01:47 AM #1

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- February 5th 2009, 01:50 AM #2

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- February 5th 2009, 01:51 AM #3

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Do you know the Quadratic formula? I suppose no so you should learn it! (You can't solve problems like this without it.)