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If a=hat(i)-hat(j)-hat(k), b=2hat(i)-3ha...

If `a=hat(i)-hat(j)-hat(k), b=2hat(i)-3hat(j)+hat(k)" and "p_(1), p_(2)` are the orthogonal projection vectors of a on b and b on a respectively, then `(p_(1)+p_(2))*(p_(1)-p_(2))=`

A

`-46/21`

B

`25/7`

C

`44/7`

D

`-88/21`

Text Solution

Verified by Experts

The correct Answer is:
D
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