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If vecA=9hati-7hatj+5hatk and vecB=3hati...

If `vecA=9hati-7hatj+5hatk` and `vecB=3hati-2hatj-6hatk` then the value of `(vecA+vecB).(vecA-vecB)` is

A

206

B

128

C

106

D

`-17`

Text Solution

Verified by Experts

The correct Answer is:
C
`(vecA+vecB).(vecA-vecB)=A^(2)-B^(2)`
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