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Given that kx^3+2x^2+2x+3 and kx^3-2x+9 have a common factor

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Given that kx^3+2x^2+2x+3 and kx^3-2x+9 have a common factor,what are the possible valucs of
Given that kx^3+2x^2+2x+3 and kx^3-2x+9 have a common factor
这意思好像是这两式相等……
用配方法……
k=1或-3
我用手机不方便,回答不详尽请见谅,
再问: 不对,答案是错的,我需要过程,谢谢