SOLUTION: Which of the following t^4-81?

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Question 5529: Which of the following t^4-81?
Answer by Abbey(339) About Me  (Show Source):
You can put this solution on YOUR website!
There are no following numbers in this equation... did you forget to type something?
this factors as the difference of squares:
(%28t%5E2%2B9%29%28t%5E2-9%29
and t%5E2-9 factors again to the difference of squares, so the final answer is
%28t%5E2%2B9%29%28t-3%29%28t%2B3%29