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(x^2)/4-(6*x)-108 = 0
(x^2)/4-6*x-108 = 0
1/4*x^2-6*x-108 = 0
DELTA = (-6)^2-(-108*1/4*4)
DELTA = 144
DELTA > 0
x = (144^(1/2)+6)/(1/4*2) or x = (6-144^(1/2))/(1/4*2)
x = 36 or x = -12
x in { -12, 36 }
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