\mathbfv \times \mathbfa = \beginpmatrix y(4) - z(-1) \\ z(2) - x(4) \\ x(-1) - y(2) \endpmatrix = \beginpmatrix 4y + z \\ 2z - 4x \\ -x - 2y \endpmatrix = \beginpmatrix 5 \\ -6 \\ -1 \endpmatrix - Nelissen Grade advocaten