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This is what you need to know in order to factor the following: x^2 + x - 225. This doesn't easily factor, since the roots are irrational. You can use the quadratic formula to determine the roots of x = -1/2 +- sqrt(901)/2. Then the answer to your question is the negative of these two x-values: 1/2+sqrt(901)/2 & 1/2-sqrt(901)/2 or approx: 15.50833102 and -14.50833102. Add them together and get +1. Mulitply and get -225. The factors are (x + 15.50833102) and (x - 14.50833102)
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