prove that a = 2î +3ĵ+k and b = 2i-4j +8k are mutually perpendicular to each other
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2
Answer:
When vector is perpendicualr dot product is zero
(2
i
^
+3
j
^
+8
k
^
).(4
j
^
−4
i
^
+α
k
^
)=0
−8+12+8α=0
8α=−4
So, α=
2
−1
α=
2
1
(2i^+3j^+8k^).(4j^−4i^+αk^)=0
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