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

Toán Lớp 8: Tìm x để: x(x+2)^2+x(x-5)-5(x+2)^2=0

Toán Lớp 8: Tìm x để:
x(x+2)^2+x(x-5)-5(x+2)^2=0

Comments ( 2 )

  1. Bạn tham khảo nhé.
    x(x+2)^2+x(x-5)-5(x+2)^2=0
    <=>(x+2)^2(x-5)+x(x-5)=0
    <=>(x-5)[(x+2)^2+x]=0
    <=>(x-5)(x^2+4x+4+x)=0
    <=>(x-5)[x(x+4)+(x+4)]=0
    <=>(x+1)(x+4)(x-5)=0
    <=>[(x+1=0),(x+4=0),(x-5=0):}
    <=>[(x=-1),(x=-4),(x=5):}
    Vậy x\in{-1;-4;5}

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