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Maths-

General

Easy

Question

If $p equals 7 i minus 2 j plus 3 k$ and $q equals 3 i plus j plus 5 k comma$ then the magnitude of $p minus 2 q$ is

$\sqrt{29}$
4
$\sqrt{62} - 2 \sqrt{35}$
$\sqrt{66}$

The correct answer is: $square root of 66$

$p minus 2 q equals i minus 4 j minus 7 k$
$vertical line p minus 2 q vertical line equals square root of 49 plus 16 plus 1 end root equals square root of 66.$

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