Question

Determine the value of a, so that If α=2i+aj+k and \eta=4i−j−2k are perpendicular.

Answer 1

Step-by-step explanation:

If two vectors are perpendicular to each other then their dot product will be 0

so as above questions we got

alpha . beta = (2i + aj+k)(4i-j-2k)

0 = 8-a-2

0 =6-a

a = 6

so the value of a is 6

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