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If vec u, vec v , vec w be vectors suc...

If` vec u, vec v , vec w ` be vectors such that ` vecu +vec v + vec w =0 and |vec u | =3, |vec v | = 4, | vec w | = 5 , " then " vec u. vec v + vec v .vec w+ vec w .vec u ` is equal to : a)47 b)-47 c)0 d)-25

A

47

B

`-47`

C

` 0`

D

` -25`

Text Solution

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The correct Answer is:
D
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