Foundation June 2018 Paper 1 Q26
26 \(\mathbf{a} = \begin{pmatrix} 5 \\ 2 \end{pmatrix} \qquad \mathbf{b} = \begin{pmatrix} -1 \\ 7 \end{pmatrix}\)
Work out \(2\mathbf{a} + \mathbf{b}\) as a column vector. (2)
| Answer | Mark | Mark scheme |
|---|---|---|
| \(\begin{pmatrix} 9 \\ 11 \end{pmatrix}\) | M1 | for \(\begin{pmatrix} 2 \times 5 \\ 2 \times 2 \end{pmatrix} \left[= \begin{pmatrix} 10 \\ 4 \end{pmatrix}\right]\) or \(2 \times 5 - 1\ (= 9)\) or \(2 \times 2 + 7\ (= 11)\) |
| A1 | cao |