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Old 08-20-2013   #4
Dark88Dragon
 
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(x-4)*(x-1) = ((x*x) + x*(-1)) (+) ((-4)*x (+) (-4*(-1)) = x*x-x-4x+4 =
x² - 5x + 4; for example: x = 10 ---> 10² - 5*10 + 4 = 100 - 50 + 4 = 54;

I hope that was not too complicated
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