Mathematics for IGCSE & O level - Vectors (Section 1 - No. 20)
If \(\vec{AB} = \begin{pmatrix} 3 \\ -4 \end{pmatrix}\), what is \(\vec{BA}\) ?
\(\begin{pmatrix} 3 \\ 4 \end{pmatrix}\)
\(\begin{pmatrix} -3 \\ 4 \end{pmatrix}\)
\(\begin{pmatrix} -3 \\ -4 \end{pmatrix}\)
\(\begin{pmatrix} 4 \\ -3 \end{pmatrix}\)
Giải thích
\(\vec{BA} = -\vec{AB}\), which is \(\begin{pmatrix} -3 \\ 4 \end{pmatrix}\)