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X in (-oo:+oo)
X^2+12*X+32/4 = 0
X^2+12*X+8 = 0
DELTA = 12^2-(1*4*8)
DELTA = 112
DELTA > 0
X = (112^(1/2)-12)/(1*2) or X = (-112^(1/2)-12)/(1*2)
X = (4*7^(1/2)-12)/2 or X = (-4*7^(1/2)-12)/2
X in { (-4*7^(1/2)-12)/2, (4*7^(1/2)-12)/2 }
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