Question 73355
x^3 + 3x^2 + 4x +12
I think the answer is: x (x^2 + 3x +4) + 12. Am I on the right track? 
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I think they want you to group and factor like this:
x^2(x+3) + 4(x+3)
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Factor out the (x+3) and you have:
(x+3)(x^2 + 4)