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

Toán Lớp 9: Giúp mik vs: 2(x^2+8x+16)-x^2+4=0

Toán Lớp 9: Giúp mik vs:
2(x^2+8x+16)-x^2+4=0

Comments ( 1 )

  1. 2(x^2+8x+16)-x^2+4=0
    <=>2x^2+16x+32-x^2+4=0
    <=>x^2+16x+36=0
    <=>(x+8)^2-28=0
    <=>(x+8-\sqrt{28})(x+8+\sqrt{28}=0
    <=>\(\left[ \begin{array}{l}x+8+\sqrt{28}=0\\x+8-\sqrt{28}=0\end{array} \right.\) 
    <=>\(\left[ \begin{array}{l}x=-\sqrt{28}-8\\x=\sqrt{28}-8\end{array} \right.\) 
    Vậy S={-\sqrt{28}-8;\sqrt{28}+8}

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