Mathematics

Problem

The points

A

and

B

have position vectors

\mathbf{a} = \mathbf{i} - 4\mathbf{j} + 2\mathbf{k}

and

\mathbf{b} = 5\mathbf{i} - 3\mathbf{j} - 2\mathbf{k}

. Find the distance

AB