Answer
$$a^4+12a^3b+54a^2b^2+108ab^3+81b^4$$
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:
$$a^4+12a^3b+54a^2b^2+108ab^3+81b^4$$
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