Answer
3x(x-3)(4x+3)
Work Step by Step
12$x^{3}$ -27$x^{2}$-27x=3x(4$x^{2}$ -9x-9)=
3x(4$x^{2}$ +3x-12x-9)=3x[x(4x+3)-3(4x+3)]=
3x(x-3)(4x+3)
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