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

Toán Lớp 9: x^2 + 5x = 0 x^2 + 4x + 4 = 0 help me

Toán Lớp 9: x^2 + 5x = 0
x^2 + 4x + 4 = 0
help me

Comments ( 2 )

  1. #heli gửi nhé
    Giải đáp:
     
    Lời giải và giải thích chi tiết:
    +)x^2 + 5x = 0
    =>x(x+5)=0
    TH1:
    x=0
    TH2:
    x+5=0
    =>x=0-5
    =>x=-5
    vậy x={0,-5}
    +)x^2 + 4x + 4 = 0
    =>(x+2)^2=0
    =>x+2=0
    =>x=0-2
    =>x=-2

  2. $x^{2}$ + 5x = 0
    <=> x ( x + 5 ) = 0
    <=> $\left \{ {{x=0} \atop {x+5=0}} \right.$ 
    <=> $\left \{ {{x=0} \atop {x=-5}} \right.$ 
    vậy S = { 0 ; -5 }
    $x^{2}$ + 4x + 4 = 0
    <=> ( x + 2 )^2 = 0
    <=> x + 2 = 0
    <=> x = -2
    Vậy S = { -2 }

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

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