CAIE A Level Mathematics 9709 · Vectors

Vectors: calculation question

3 marksStandard

The vectors $\mathbf{p} = 5\mathbf{i} - \mathbf{j} + 2\mathbf{k}$ and $\mathbf{q} = 3\mathbf{i} + 5\mathbf{j} + \lambda\mathbf{k}$ are perpendicular.

(a)
Find the value of $\lambda$ .
[3]

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