Let
a
⃗
=
8
i
⃗
−
4
j
⃗
+
1
k
⃗
\displaystyle \vec{{a}}={8}\vec{{{i}}}-{4}\vec{{{j}}}+{1}\vec{{{k}}}
a
=
8
i
−
4
j
+
1
k
and
b
⃗
=
2
i
⃗
+
6
j
⃗
−
9
k
⃗
\displaystyle \vec{{b}}={2}\vec{{{i}}}+{6}\vec{{{j}}}-{9}\vec{{{k}}}
b
=
2
i
+
6
j
−
9
k
. Find
a
⃗
⋅
b
⃗
\displaystyle \vec{{a}}\cdot\vec{{b}}
a
⋅
b
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Enter DNE for Does Not Exist, oo for Infinity