Let
u
⃗
=
⟨
−
7
,
−
2
,
−
2
⟩
\displaystyle \vec{{{u}}}={\left\langle-{7},-{2},-{2}\right\rangle}
u
=
⟨
−
7
,
−
2
,
−
2
⟩
.
−
2
u
⃗
=
\displaystyle -{2}\vec{{{u}}}=
−
2
u
=
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