Prove that (a-b) x (a+b)=2a x b is true. (a and b are vectors)

1 answer
Question:

Prove that (a-b) x (a+b)=2a x b is true. (a and b are vectors)

Answers

(a-b)*(a+b)= a*a + a*b - b*a - b*b asa*a = 0 and b*b = 0 -b*a=a*b then (a-b)*(a+b) = a*b +a*b = 2(a*b) 

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