$$\lim_{y \to 0^-}\left(- x + y^{2}\right) = - x$$ More at y→0 from the left $$\lim_{y \to 0^+}\left(- x + y^{2}\right) = - x$$ $$\lim_{y \to \infty}\left(- x + y^{2}\right) = \infty$$ More at y→oo $$\lim_{y \to 1^-}\left(- x + y^{2}\right) = 1 - x$$ More at y→1 from the left $$\lim_{y \to 1^+}\left(- x + y^{2}\right) = 1 - x$$ More at y→1 from the right $$\lim_{y \to -\infty}\left(- x + y^{2}\right) = \infty$$ More at y→-oo