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x in (-oo:+oo)
1100-((x/400)*x) = 0
(-1/400)*x^2+1100 = 0
-1/400*x^2 = -1100 // : -1/400
x^2 = 440000
x^2 = 440000 // ^ 1/2
abs(x) = 200*11^(1/2)
x = 200*11^(1/2) or x = -(200*11^(1/2))
x in { 200*11^(1/2), -(200*11^(1/2)) }
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