a=(32)\mathbf{a} = \begin{pmatrix} 3 \\ 2 \end{pmatrix}a=(32) b=(−15)\mathbf{b} = \begin{pmatrix} -1 \\ 5 \end{pmatrix}b=(−15)
Work out 3a+b3\mathbf{a} + \mathbf{b}3a+b as a column vector.
