Question

solution bhejna explanation nhi​

Answer 1

Answer:

Two vectors A and B are perpendicular if and only if their scalar product is equal to zero.

Explanation:

First of all note that A and B are unit vectors so A.B=cosine of angle between A and B. Two vectors are said to be perpendicular if thier dot(scalar)product is zero. Thus(A+2B). (5A-4B)=0 i.e. 5–4A.

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