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x in (-oo:+oo)
360-x^2-((x^2)/2) = 3*x // - 3*x
360-x^2-((x^2)/2)-(3*x) = 0
360-x^2-((x^2)/2)-3*x = 0
360-3/2*x^2-3*x = 0
DELTA = (-3)^2-(-3/2*4*360)
DELTA = 2169
DELTA > 0
x = (2169^(1/2)+3)/(-3/2*2) or x = (3-2169^(1/2))/(-3/2*2)
x = (3*241^(1/2)+3)/(-3) or x = (3-3*241^(1/2))/(-3)
x in { (3*241^(1/2)+3)/(-3), (3-3*241^(1/2))/(-3) }
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