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If A1 and A2 are two vectors such that | A1 | = 3 and | A2 | = 5 and | A1 + A2 | = 5, the value of (2A1 + 3 A2 ).(2A1 – 2 A2 ) is-

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If A1 and A2 are two vectors such that | A1 | = 3 and | A2 | = 5 and | A1 + A2 | = 5, the value of (2A1 + 3 A2 ).(2A1 – 2 A2 ) is-

(1) 130

(2) -123

(3) 250

(4) 300/7

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1 Answer

+1 vote
by (69.8k points)

The correct option is (2) -123.

Explanation:

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