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Problem
Problem
If a vector
2
i
^
+
3
j
^
+
8
k
^
2\hat{i} + 3\hat{j} + 8\hat{k}
2
i
^
+
3
j
^
+
8
k
^
is perpendicular to the vector
4
i
^
−
4
j
^
+
α
k
^
4\hat{i} - 4\hat{j} + \alpha\hat{k}
4
i
^
−
4
j
^
+
α
k
^
, then the value of
α
\alpha
α
is a.
−
1
-1
−
1
b.
1
2
\frac{1}{2}
2
1
c.
−
1
2
-\frac{1}{2}
−
2
1
d.
1
1
1
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