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Question

Angle between the vectors a=^i+2^j+^k and b=x^i+^j+(x2)^k

A
is obtuse angle
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B
is acute angle
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C
is 90o
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D
depends upon x
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Solution

The correct option is C is 90o
a=^i+2^j+^k
b=x^i+^j+(x2)^k
cos θ=a.b|a||b|
cos θ=x+2+x2ab
cos θ=0
θ=90o

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