Question 108519
The question ask is to "solve by factoring" the problem listed below.  The answer given is -1, -12.

x^2-13x=-12

x^2-13x+12 = -12+12
x^2-13x+12 = 0
(x-12)(x-1)= 0
x = 12 or x = 1
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Cheers,
Stan H.