Answer
$$x^5+25x^4+250x^3+1250x^2+3125x+3125$$
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:
$$x^5+25x^4+250x^3+1250x^2+3125x+3125$$
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