Mathematics for IGCSE & O level - Vectors (Section 2 - No. 18)
If \(\vec{a} = \begin{pmatrix} 3 \\ -1 \end{pmatrix}\), what is -3\(\vec{a}\)?
\(\begin{pmatrix} -9 \\ 3 \end{pmatrix}\)
\(\begin{pmatrix} -6 \\ 3 \end{pmatrix}\)
\(\begin{pmatrix} 0 \\ -3 \end{pmatrix}\)
\(\begin{pmatrix} 6 \\ 3 \end{pmatrix}\)
Explanation
-3a = -3\(\begin{pmatrix} 3 \\ -1 \end{pmatrix}\) = \(\begin{pmatrix} -9 \\ 3 \end{pmatrix}\)
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