| Exam Board | OCR MEI |
|---|
| Module | Paper 1 (Paper 1) |
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| Year | 2020 |
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| Session | November |
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| Topic | Vectors 3D & Lines |
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3 The points \(A\) and \(B\) have position vectors \(\mathbf { a } = \left( \begin{array} { r } 3
2
- 1 \end{array} \right)\) and \(\mathbf { b } = \left( \begin{array} { r } - 1
4
8 \end{array} \right)\) respectively.
Show that the exact value of the distance \(A B\) is \(\sqrt { \mathbf { 1 0 1 } }\).