(u^2+3u+1)(u^3+u^2+u)
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Answer:
(u^2+3u+1) u(u^2+u+1)
=u(u^2+3u+1)^2
=u(u^4+u2+1+2u^3+2u+2u^2)
=u(u^4+2u^3+3u^2+2u+1)
=u^5+2u^4+3u^3+2u^2+2u.
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