Question

If a and b are two vectors, then the value of (a+b)x(a - b) is:-

(1) axb
(2) bxa
(3) -2(bxa)
(4) 2(bxa)​

Answer 1

Answer:

option 3 . -2(b×a)

Explanation:

since both are vrctor

Answer 2

Answer:

Explanation:

(a+b)×(a-b)=a×a -b×b +b×a -a×b

= 0 -0 +2(b×a)

=2(b×a)

[where a×a is equal to zero as the angle of a vector to itself is zero and -(a×b) = (b×a) .]