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Q in (-oo:+oo)
1200 = 6*Q-((Q^2)/200) // - 6*Q-((Q^2)/200)
(Q^2)/200-(6*Q)+1200 = 0
(Q^2)/200-6*Q+1200 = 0
1/200*Q^2-6*Q+1200 = 0
DELTA = (-6)^2-(1/200*4*1200)
DELTA = 12
DELTA > 0
Q = (12^(1/2)+6)/(1/200*2) or Q = (6-12^(1/2))/(1/200*2)
Q = 100*(2*3^(1/2)+6) or Q = 100*(6-2*3^(1/2))
Q in { 100*(6-2*3^(1/2)), 100*(2*3^(1/2)+6) }
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