factor completely $\displaystyle (c-d)^2-e^2$ $\displaystyle m^2-(n-1)^2$ $\displaystyle x^4-1$ wow i am so stupid i completely forgot $\displaystyle a^2-b^2$
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you just need to know that $\displaystyle a^2 - b^2 = (a-b)(a+b) $ for example last one $\displaystyle x^4 -1 = (x^2 -1 )( x^2 +1 ) = (x-1)(x+1)(x^2+1) $
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