April 2, 2011 5:19pm UTC
Factor each the end terms into two factors that will add to the value of the center term.
(-9,-1 or 1,9 or -3,-3 or 3,3)
Do the same for 36 to see what combination will add to -36 for the center term.
Use the factors you found to solve for x.
April 3, 2011 3:38pm UTC
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