Posted by Shelley on Wednesday, November 24, 2010 at 5:01pm.
say for example
x^2-3x+2 = 0
factor that left side
(x-2)(x-1) = 0
That tells you that if x = 2, the function is zero, because (2-2)=0
It also tells you that if x = 1, the function is zero. (1-1) = 0
so the solution is x = 2 or x = 1
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