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