Answer
$$t^6+18t^5+135t^4+540t^3+1215t^2+1458t+729$$
Work Step by Step
The binomial theorem allows us to expand the given expression without multiplying it out. Doing this, we find:
$$t^6+18t^5+135t^4+540t^3+1215t^2+1458t+729$$
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