x^4-2^3-6x^2+6x+9怎样因式分解?
人气:344 ℃ 时间:2020-02-05 00:31:07
解答
x^4-2x^3-6x^2+6x+9
= (x^4-6x^2+9)-(2x^3+6x)
= (x^2-3)^2-2x(x^2-3)
= (x^2-3)(x^2-2x-3)
= (x+√3)(x-√3)(x-3)(x+1)
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