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Question 166162: Factor completely:
x2 – 9x + 20
Answer by nerdybill(7384)   (Show Source):
You can put this solution on YOUR website! This site gives a nice tutorial on factoring:
http://www.purplemath.com/modules/factquad.htm
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x^2 – 9x + 20
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Basically, you're looking for two factors of 20 that when combined together gives you -9. The two factors are -4 and -5.
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Which results in:
(x-4)(x-5)
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