how can I factor this x9 - 81

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it is a difference of perfect squares, which takes the form (a-b)(a+b). 

you cant factor x­^9-81 there is no square to x^9 as its not an even exponent remember x^3·x^3=x^6 not x^9. and I'm sorry doggilov this is not a difference of squares.had it been x^8 or x^6 it would be.