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x in (-oo:+oo)
y = (1/4)*x^2-5 // - (1/4)*x^2-5
y-((1/4)*x^2)+5 = 0
(-1/4)*x^2+y+5 = 0
-1/4*x^2 = -(y+5) // : -1/4
x^2 = 4*(y+5)
x^2 = 4*(y+5) // ^ 1/2
abs(x) = 2*(y+5)^(1/2)
x = 2*(y+5)^(1/2) or x = -(2*(y+5)^(1/2))
x in { 2*(y+5)^(1/2), -(2*(y+5)^(1/2)) }
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