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x in (-oo:+oo)
(1/4)*x^2 = 1000*x // - 1000*x
(1/4)*x^2-(1000*x) = 0
(1/4)*x^2-1000*x = 0
1/4*x^2-1000*x = 0
DELTA = (-1000)^2-(0*1/4*4)
DELTA = 1000000
DELTA > 0
x = (1000000^(1/2)+1000)/(1/4*2) or x = (1000-1000000^(1/2))/(1/4*2)
x = 4000 or x = 0
x in { 0, 4000 }
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