SOLUTION: Factor, if possible t^6 - 18t^3 + 81

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Question 322675: Factor, if possible
t^6 - 18t^3 + 81
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Substitute.
Let u=t%5E3, u%5E2=t%5E6
t%5E6+-+18t%5E3+%2B+81=u%5E2+-+18u+%2B+81
t%5E6+-+18t%5E3+%2B+81=%28u-9%29%5E2
t%5E6+-+18t%5E3+%2B+81=%28t%5E3-9%29%5E2