to to show that (a - b) x (a + b) = 2(a x b) please help me, not sure how to show this one. (cross product)
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Just apply basic properties that you are supposed to know. $\displaystyle u \times \left( {a + b} \right) = \left( {u \times a} \right) + \left( {u \times b} \right)$. Let $\displaystyle u=a-b$ and apply again.
i just get confused by proofs, atleast now i can go through and kinda see whats going on, thanks.
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