how do you factor completely 12x-3x^3

How do you factor 12x-3x^3 completely
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Both terms contain x so x is a factor. Since 3 divides into 12 and 3, 3x is a factor. 3x(4-x^2). 4-x^2 factorises further because it's the difference of two squares (2-x)(2+x). The completed factorisation is 3x(2-x)(2+x).

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