Given |A⃗_1|=2,|A⃗_2|=3 and |A⃗_1+A⃗_2|=3. Find the value of (A⃗_1+2 A⃗_2) ·(3 A⃗_1-4 A⃗_2). (1) ...

Given |A⃗_1|=2,|A⃗_2|=3 and |A⃗_1+A⃗_2|=3. Find the value of (A⃗_1+2 A⃗_2) ·(3 A⃗_1-4 A⃗_2).
(1) -64
(2) 60
(3) -60
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