If veca and vecb are vectors such that |...

If `veca and vecb` are vectors such that `|veca + vecb|= sqrt29and veca xx (2 hati + 3 hatj + 4 hatk)= (2 hati + 3 hatj + 4 hatk) xx vecb,` then a possible value of `(veca + vecb).(-7hati + 2 hatj + 3 hatk)` is:

A

0

B

3

C

4

D

8

Verified by Experts

The correct Answer is:

C

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