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Best Answer

n3 + 3n2 + 4n + 12 = (n3 + 3n2) + (4n + 12)

= n2(n + 3) + 4(n + 3)

= (n2 + 4)(n + 3).

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Q: Factor the polynomial by grouping n3 plus 3n2 plus 4n plus 12?
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