Differentiation

Consider the functions defined implicitly by the equation y3 − 3y + x = 0 on various intervals in the real line. If x ∈ (-∞, -2) ∪ (2, ∞), the equation implicitly defines a unique real valued differentiable function y = f(x).

If x ∈(-2, 2), the equation implicitly defines a unique real valued differentiable function y = g(x) satisfying g(0) = 0.
If f (-10 √2) = 2 √2, then f ′′(-10 √2) = ??