Question

I f A=2i+3j+8k is perpendicular to B=4j-4k+ αk, then the value of ‘ α ’ is

a) ½ b) -1/2 c) 1 d)-1​

Answer 1

Answer:

As it is perpendicular A.B=0.

2(4)+3(-4)+8(a)=0

-4+8a=0

a=1/2

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