Answer:
x^8 - 6561
= (x^4 + 81)(x^4 - 81) .... one of these can't be factored further, but we have another difference of squares!
= (x^4 + 81)(x² + 9)(x² - 9)
= (x^4 + 81)(x² + 9)(x + 3)(x - 3) .... this is your final answer
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