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问题: 求因式分解:x^4+2x^2-x+2

解答:

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