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

Toán Lớp 8: `x^2 + 4x = -4` $ $

Toán Lớp 8: x^2 + 4x = -4
$ $

Comments ( 2 )

  1. x^{2} + 4x = -4
    => x^{2} + 4x + 4 = 0
    => ( x + 2)^{2} = 0
    => x + 2 = 0
    => x = -2
     

  2.    $x^2+4x=-4^{}$
    ⇒$x^2+4x+4=0^{}$
    ⇒$x^2+4x+2^2=0^{}$ (Hàng đẳng thức số 1)
    ⇒$(x+2)^2=0^{}$
    ⇒$x+2=0^{}$
    ⇒$x=0-2^{}$
    ⇒$x=-2^{}$

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

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