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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: x^3+x^2-11x+10=0 helpppppppppppppppppp

Toán Lớp 8: x^3+x^2-11x+10=0
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Comments ( 1 )

  1. Lời giải và giải thích chi tiết:
     x^3+x^2-11x+10=0
    =>(x^3-2x^2)+(3x^2-6x)-(5x-10)=0
    =>(x-2)(x^2+3x-5)=0
    =>(x-2)[(x^2+3x+9/4)-29/4]=0
    =>(x-2)[(x+3/2)^2-29/4)=0
    =>(x-2)(x+3/2-sqrt29/2)(x+3/2+sqrt29/2)=0
    =>\(\left[ \begin{array}{l}x=2\\x=\dfrac{\sqrt{29}-3}2\\x=\dfrac{-\sqrt{29}-3}2\end{array} \right.\) 

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222-9+11+12:2*14+14 = ? ( )