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Mathematics
Mathematics
Problem
Find
a
⋅
b
\mathbf a \cdot \mathbf b
a
⋅
b
when
a
=
2
i
^
−
j
^
+
3
k
^
\mathbf a = 2\hat i - \hat j + 3\hat k
a
=
2
i
^
−
j
^
+
3
k
^
and
b
=
4
i
^
+
5
j
^
−
2
k
^
\mathbf b = 4\hat i + 5\hat j - 2\hat k
b
=
4
i
^
+
5
j
^
−
2
k
^
. a)
19
19
19
b)
3
3
3
c)
−
3
-3
−
3
d)
9
9
9
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