Let a = i + 2 j - k and b = -2 i + j + k , where R. If the area of the parallelogram whose adjacent sides are...

Question

Let a = i + 2 j - k and b = -2 i + j + k , where R. If the area of the parallelogram whose adjacent sides are represented by the vectors a and b is 15( ^ 2 + 4) , then the value of 2| a |^ 2 + ( a b )| b |^ 2 is equal to :

Accepted Answer

(4)

JEE Main 2022 Mathematics question

Solution

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