Answer
$u=4i-2j$
Work Step by Step
If $v =\left\langle a,b \right\rangle$, then $v = ai + bj$, where $ i = \left\langle 1,0 \right\rangle$ and $
j=\left\langle 0,1 \right\rangle$.
Now given $u =\left\langle 4,-2 \right\rangle$ then,
$u= 4i + (-2)j=4i-2j$
Therefore, the vector $u =\left\langle 4,-2 \right\rangle$ is written in $i, j$ form as $u=4i-2j$.
