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问题: 2(x^2+6x+1)^2+5(x^2+1)(x^2+6x+1)+2(x+1)^2分解因式

希望过程详细些~谢谢~答案是9(x+1)^2(x^2+4x+1)~

解答:

2(x^2+6x+1)^2+5(x^2+1)(x^2+6x+1)+2(x+1)^2
,,,,,,,,,,,,,,,,,,,,用十字交叉法
=2(x^2+6x+1)^2+(x^2+1)(x^2+6x+1)
+4(x^+1)(x^2+6x+1)+2(x^2+1)^2
=(x^2+6x+1)[2(x^2+6x+1)+(x^2+1)]
+2(x^2+1)[2(x^2+6x+1)+(x^2+1)]
=[2(x^2+6x+1)+(x^2+1)]*[(x^2+6x+1)+2(x^2+1)]
=(3x^2+12x+3)(3x^2+6x+3)
=9(x^2+4x+1)(x+1)^2