\(a,3x^2-3x=3x\left(x-1\right)\\ b,x^3-4x^2+4x=x\left(x^2-4x+4\right)=x\left(x-2\right)^2\\ c,x^2-5x-6=x^2+x-6x-6=\left(x^2+x\right)-\left(6x+6\right)=x\left(x+1\right)-6\left(x+1\right)=\left(x+1\right)\left(x-6\right)\)
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