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Mathematics
Problem
Let
a
=
2
i
−
j
+
3
k
\mathbf{a}=2\mathbf{i}-\mathbf{j}+3\mathbf{k}
a
=
2
i
−
j
+
3
k
and
b
=
4
i
−
2
k
\mathbf{b}=4\mathbf{i}-2\mathbf{k}
b
=
4
i
−
2
k
. Find
2
a
−
1
2
b
2\mathbf{a}-\dfrac12\,\mathbf{b}
2
a
−
2
1
b
. a)
6
i
−
2
j
+
5
k
6\mathbf{i}-2\mathbf{j}+5\mathbf{k}
6
i
−
2
j
+
5
k
b)
4
i
−
2
j
+
6
k
4\mathbf{i}-2\mathbf{j}+6\mathbf{k}
4
i
−
2
j
+
6
k
c)
2
i
−
2
j
+
7
k
2\mathbf{i}-2\mathbf{j}+7\mathbf{k}
2
i
−
2
j
+
7
k
d)
2
i
+
2
j
+
7
k
2\mathbf{i}+2\mathbf{j}+7\mathbf{k}
2
i
+
2
j
+
7
k
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