A cantilever beam of length $L$ is fixed at $x = 0$ and free at $x = L$. It is subjected to a distributed load $w(x) = w_0 \\frac{x^2}{L^2}$. The deflection $y(x)$ satisfies the Euler-Bernoulli beam equation $EI \\frac{d^4y}{dx^4} = -w(x)$, with boundary conditions $y(0) = 0, y'(0) = 0$ (clamped at $x=0$), and $y''(L) = 0, y'''(L) = 0$ (free at $x=L$). What is the bending moment $M(x) = EI y''(x)$ as a function of $x$?