Answer
$$81u^4+108u^3v+54u^2v^2+12uv^3+v^4$$
Work Step by Step
We know from the Binomial Theorem (page 693) that we can expand the given expression without multiplying it out. Doing this, we obtain:
$$81u^4+108u^3v+54u^2v^2+12uv^3+v^4$$
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