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x^4+2x^3-2x^2-3x+2因式分解

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/07/14 21:51:58
x^4+2x^3-2x^2-3x+2因式分解
答:
x^4+2x^3-2x^2-3x+2
=(x-1)x^3+3x^3-3x^2+x^2-3x+2
=(x-1)(x^3-3x^2)+(x-1)(x-2)
=(x-1)(x^3-3x^2+x-2)
=(x-1)[x^3-2x^2-(x^2-x+2)]
=(x-1)*[(x-2)x^2-(x-2)(x+1)]
=(x-1)*(x-2)*(x^2-x-1)
再问: =(x-1)(x^3-3x^2)+(x-1)(x-2)

这一步应该是x^3+3x^2吧?
再答: 答:不好意思,重新解答如下:

x^4+2x^3-2x^2-3x+2
=(x-1)x^3+3x^3-3x^2+x^2-3x+2
=(x-1)(x^3+3x^2)+(x-1)(x-2)
=(x-1)(x^3+3x^2+x-2)
=(x-1)[x^3+2x^2+(x^2+x-2)]
=(x-1)*[(x+2)x^2+(x+2)(x-1)]
=(x-1)*(x+2)*(x^2+x-1)