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t^4 - 81. = (t^2)^2 - (3^2)^2. = (t^2 - 3^2)(t^2 + 3^2). = (t - 3)(t + 3)(t^2 + 9).
http://wiki.answers.com/Q/What_are_the_factors_of_...
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3 is the prime factor for 81.
http://wiki.answers.com/Q/What_is_a_prime_factor_f...
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3^4 or 3*3*3*3.
http://wiki.answers.com/Q/What_is_prime_factorizat...
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The factors of 81 are 1, 3, 9, 27, 81. For them to be common, they need to be compared to another set of factors.
http://wiki.answers.com/Q/What_are_81's_comon_fact...
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