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Maths-

General

Easy

Question

What should be added in vector $a equals 3 i plus 4 j minus 2 k$ to get its resultant a unit vector i

$- 2 i - 4 j + 2 k$
$- 2 i + 4 j - 2 k$
$2 i + 4 j - 2 k$
None of these

The correct answer is: $negative 2 i minus 4 j plus 2 k$

Let $b$ should be added, then $a plus b equals i$
$rightwards double arrow b equals i minus a equals i minus left parenthesis 3 i plus 4 j minus 2 k right parenthesis equals negative 2 i minus 4 j plus 2 k.$

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