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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)

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