Let a = i + j + k and b = 3 i - 5 j + 4 k be two vectors, such that a b = - i + 9 j + 12 k . Then the projection of b - 2 a on b + a is equal to

JEE Main 2022 Mathematics question

Let and be two vectors, such that . Then the projection of on is equal to

Answer: (4)

. So = −1 gives = −1, and gives = −3. Then $ = -3 +

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Question ID VK-034427