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问题: 一道分解因式

2a(a^2+a+1)+a^4+a^2+1
如何分解??

解答:

2a(a^2+a+1)+a^4+a^2+1
= 2a(a^2+a+1) + a^2(a^2+a+1) - a^3 + 1
= (2a + a^2)(a^2+a+1) - (a^3 - 1)
= (2a + a^2)(a^2+a+1) - (a - 1)(a^2+a+1)
= (a^2 + 2a - a + 1)(a^2+a+1)
= (a^2+a+1)^2