27x^3 8

27x^{3}-8= (3x)^{3}-2^{3 }= (3x-2)[(3x)^{2}+3x*2+2^{2}]= (3x-2)(9x^{2}+6x+4)

or

27x^{3}+8= (3x)^{3}+2^{3 }= (3x+2)[(3x)^{2}-3x*2+2^{2}]= (3x+2)(9x^{2}-6x+4)

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