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If vec(a) = 3hat(i) + 2hat(j) + 9hat(k) ...

If `vec(a) = 3hat(i) + 2hat(j) + 9hat(k) and vec(b) = hat(i) = lambda hat(j)+ 3hat(k)`, then the value of `lambda` so that `vec(a) + vec(b)` is perpendicular to `vec(a) - vec(b)` is

A

`pm sqrt(21)`

B

`pm 2sqrt(22)`

C

`pm 2sqrt(21)`

D

`sqrt(15)`

Text Solution

Verified by Experts

The correct Answer is:
C
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