If a vector 2iˆ+3jˆ+7kˆ is divided by -8, the resultant is−14iˆ−38jˆ+xkˆ then the value of x is
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Answer:
For perpendicular vectors.
A
⋅
B
=0
(2
i
^
+3
j
^
+8
k
^
)⋅(4
i
^
−4
j
^
+α
k
^
)=0
8−12+8α=0
−4+8α=0
⇒α=
2
1
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