If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
y = (-1/2)*x^2-1 // - (-1/2)*x^2-1
y-((-1/2)*x^2)+1 = 0
(1/2)*x^2+y+1 = 0
1/2*x^2 = -(y+1) // : 1/2
x^2 = -2*(y+1)
x^2 = -2*(y+1) // ^ 1/2
abs(x) = (-2)^(1/2)*(y+1)^(1/2)
x = (-2)^(1/2)*(y+1)^(1/2) or x = -((-2)^(1/2)*(y+1)^(1/2))
x in { (-2)^(1/2)*(y+1)^(1/2), -((-2)^(1/2)*(y+1)^(1/2)) }
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