a=(1−2)\mathbf{a} = \begin{pmatrix} 1 \\ -2 \end{pmatrix}a=(1−2) b=(38)\mathbf{b} = \begin{pmatrix} 3 \\ 8 \end{pmatrix}b=(38)
Work out 4a+b4\mathbf{a} + \mathbf{b}4a+b as a column vector.
