1.

Show that (a -b) x (a + b)-2 (a xb)

Answer»

(a-b)x(a+b)= axa + axb - bxa - bxb

you know axa = 0 and bxb = 0

you know

-bxa=axb then

(a-b)x(a+b) = axb +axb = 2(axb)



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