Solution to #4-1

Paper 1 Difficulty:Medium

Let $latex \vec{v}=\begin{pmatrix}
1\\
2\\
3
\end{pmatrix}$, and $latex \vec{w}=\begin{pmatrix}
-3\\
1\\
2
\end{pmatrix}$.

If $latex \vec{u}=\vec{v}-2\vec{w}$, find the magnitude of vector $latex \vec{u}$.

[Maximum mark:5]


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