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x in (-oo:+oo)
(x^2)/8000+3*x+10000 = 0
1/8000*x^2+3*x+10000 = 0
DELTA = 3^2-(1/8000*4*10000)
DELTA = 4
DELTA > 0
x = (4^(1/2)-3)/(1/8000*2) or x = (-4^(1/2)-3)/(1/8000*2)
x = -4000 or x = -20000
x in { -20000, -4000 }
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