b and c satisfy the condition a + b + c = 0 . Evaluate the quantity u = a . b + b . c + c . a

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Example 29 Three vectors a, b and c satisfy the condition a + b + c = 0 . Evaluate the quantity u = a . b + b . c + c . a, if I a I = 3, I b I = 4, and I c I = 2
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Example 29 Three vectors a, b and c satisfy the condition a + b + c = 0 . Evaluate the quantity u = a . b + b . c + c . a, if I a I = 3, I b I = 4, and I c I = 2 and I c [...]
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Tags: and I c I = 2 , b and c satisfy the condition a + b + c = 0 . Evaluate the quantity u = a . b + b . c + c . a , Example 29 Three vectors a , I b I = 4 , if I a I = 3 ,