Question from Vectors...
If A= 4i-2j+4k and B= -4i+2j+ak are perpendicular to each other find the value of 'a' ?
Ans Given:-5
Plz Describe....
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Answer:5
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a = 5
A = 4i-2j+4k and
B = -4i+2j+ak
If they are perpendicular to each other the we can write it as,
4 × (-4) + (-2) × 2 + 4 × a = 0
-16 + (-4) + 4a = 0
-20 + 4a = 0
4a = 20
a = 20/4
a = 5
The value of 'a' is 5.
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