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x in (-oo:+oo)
Y = (1/4)*x^2-3 // - (1/4)*x^2-3
Y-((1/4)*x^2)+3 = 0
Y+(-1/4)*x^2+3 = 0
-1/4*x^2 = -(Y+3) // : -1/4
x^2 = 4*(Y+3)
x^2 = 4*(Y+3) // ^ 1/2
abs(x) = 2*(Y+3)^(1/2)
x = 2*(Y+3)^(1/2) or x = -(2*(Y+3)^(1/2))
x in { 2*(Y+3)^(1/2), -(2*(Y+3)^(1/2)) }
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