在实数范围内因式分解：x4+x3-3x2-4x-4=______．
人气：229 ℃ 时间：2019-08-20 13:35:46
解答
x4+x3-3x2-4x-4
=x4+x3+x2-4x2-4x-4
=x2（x2+x+1）-4（x2+x+1）
=（x2-4）（x2+x+1）
=（x+2）（x-2）（x2+x+1）．
故答案为：（x+2）（x-2）（x2+x+1）．
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