Mathematics for IGCSE & O level - Vectors (Section 1 - No. 26)
Given \(p = \begin{pmatrix} 1 \\ 4 \end{pmatrix}\), which of the following is -2p?
\(\begin{pmatrix} -2 \\ -8 \end{pmatrix}\)
\(\begin{pmatrix} -1 \\ -2 \end{pmatrix}\)
\(\begin{pmatrix} 3 \\ 6 \end{pmatrix}\)
\(\begin{pmatrix} -2 \\ 4 \end{pmatrix}\)
Explication
-2p = -2\(\begin{pmatrix} 1 \\ 4 \end{pmatrix}\) = \(\begin{pmatrix} -2 \\ -8 \end{pmatrix}\)