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 = (1/8)*x^2 // - (1/8)*x^2
y-((1/8)*x^2) = 0
(-1/8)*x^2+y = 0
-1/8*x^2 = -y // : -1/8
x^2 = 8*y
x^2 = 8*y // ^ 1/2
abs(x) = 2*2^(1/2)*y^(1/2)
x = 2*2^(1/2)*y^(1/2) or x = -(2*2^(1/2)*y^(1/2))
x in { 2*2^(1/2)*y^(1/2), -(2*2^(1/2)*y^(1/2)) }
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