If ABC is right angled at A, where A (4,2,x),B (3,1,8) and C (2,-1,2), then the value of x is

MHT CET 2023 Mathematics question

If is right angled at A, where and , then the value of x is

Answer: (C)

Right angle at A means . and . Dot product: , so or .

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Question ID VK-098367