If a vector 2i^+3j^ + 8k^ is a perpendicular to d vector 2j^ - 4i^ + ak^. then d value of a is
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since these vectors are perpendicular to each other hence their dot product must be 0
a.d=|a||d|cosx
2×-4+3×2+8×a=0
-8+6+8a=0
8a=2
a=2/8
a=1/4
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Hey mate your answer is given below
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