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

Toán Lớp 8: x ²(x+1) + 2x (x+1) = 0 (Tìm x)

Toán Lớp 8: x ²(x+1) + 2x (x+1) = 0 (Tìm x)

Comments ( 2 )

  1. x²(x+1)+2x(x+1)=0
    <=> (x+1)(x²+2x)=0
    <=>x(x+1)(x+2)=0
    =>\(\left[ \begin{array}{l}x=0\\x+1=0\\x+2=0\end{array} \right.\) 
    =>\(\left[ \begin{array}{l}x=0\\x=-1\\x=-2\end{array} \right.\) 

  2. x^2(x+1)+2x(x+1)=0
    (x+1)(x^2+2x)=0
    x(x+1)(x+2)=0
    =>{(x=0),(x+1=0),(x+2=0):}
    =>{(x=0),(x=0-1),(x=0-2):}
    =>{(x=0),(x=-1),(x=-2):}
    Vậy x in{0;-1;-2}.

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