[Toán8] Phân tích đa thức: $x^4-5x^3+10x+4$

V

vitconvuitinh

[TEX]x^4-5x^3+10x+4=x^4+x^3-6x^3-6x^2+6x^2+6x+4x+4=(x+1)(x^3-6x^2+6x+4)=(x+1)(x^3-2x^2-4x^2+8x-2x+4)=(x+1)(x-2)(x^2-4x-2)=(x+1)(x-2)(x^2-4x+4-6)=(x+1)(x-2)[(x-2)^2-6]=(x+1)(x-2)(x-2+\sqrt[]{6})(x-2-\sqrt[]{6}[/TEX]
 
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