Question 171677
Factor by grouping (3x^3)+(x^2)+(12x)+(4), 
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= x^2(3x+1)+ 4(3x+1)

= (3x+1)(x^2+4)

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factor the trinomial (9x^2)-(24x)+(16)
(3x-4)(3x-4)
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Cheers,
Stan H.