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x in (-oo:+oo)
x*((2*x^2+4*x+12)/2) = 0
(x*(2*x^2+4*x+12))/2 = 0
2*x^2+4*x+12 = 0
2*(x^2+2*x+6) = 0
x^2+2*x+6 = 0
DELTA = 2^2-(1*4*6)
DELTA = -20
DELTA < 0
2 = 0
x = 0
x = 0
x = 0
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