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x in (-oo:+oo)
x*((8*x^2+4*x+12)/4) = 0
(x*(8*x^2+4*x+12))/4 = 0
8*x^2+4*x+12 = 0
4*(2*x^2+x+3) = 0
2*x^2+x+3 = 0
DELTA = 1^2-(2*3*4)
DELTA = -23
DELTA < 0
4 = 0
x = 0
x = 0
x = 0
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