(a)[2]
Work out the value of $3\mathbf{a}-\mathbf{b}$.
(b)[3]
Find the magnitude of $|\mathbf{a}+\mathbf{b}|$.
Mathematics 4024 · O Level · Vectors in two dimensions
Vectors in two dimensions — practice question
Given $\mathbf{a}=\begin{pmatrix}-3\\4\end{pmatrix}$ and $\mathbf{b}=\begin{pmatrix}8\\-2\end{pmatrix}$.