The generalized eigenvalue problem seeks $\lambda$ and nonzero $x$ such that $Ax = \lambda Bx$ (not $Ax = \lambda x$). For $A = \begin{pmatrix} 4 & 0 \\ 0 & 6 \end{pmatrix}$ and $B = \begin{pmatrix} 2 & 0 \\ 0 & 2 \end{pmatrix}$, what are the generalized eigenvalues?