y=X-2/2x^2-X-1

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Solution for y=X-2/2x^2-X-1 equation: 


x in (-oo:+oo)

y = X-X-((2/2)*x^2)-1 // - X-X-((2/2)*x^2)-1

X-X+(2/2)*x^2+y+1 = 0

1*x^2 = -(y+1) // : 1

x^2 = -(y+1)

x^2 = -(y+1) // ^ 1/2

abs(x) = (-(y+1))^(1/2)

x = (-(y+1))^(1/2) or x = -(-(y+1))^(1/2)

x in { (-(y+1))^(1/2), -(-(y+1))^(1/2) }

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