gaucekatinna
gaucekatinna gaucekatinna
  • 08-08-2016
  • Mathematics
contestada

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

Respuesta :

Hussain514 Hussain514
  • 12-08-2016
(a-b)*(a+b)= a*a + a*b - b*a - b*b 

as

a*a = 0 and b*b = 0 



-b*a=a*b then 

(a-b)*(a+b) = a*b +a*b = 2(a*b) 
Answer Link

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