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

Toán Lớp 9: Giải pt sau: x -$\sqrt[]{5x+4}$ =2

Toán Lớp 9: Giải pt sau:
x -$\sqrt[]{5x+4}$ =2

Comments ( 1 )

  1. ${x-\sqrt[]{5x+4}=2}$         ${ĐKXĐ:x≥2}$
    ${⇔\sqrt[]{5x+4}=x-2}$
    ${⇔5x+4=(x-2)²}$
    ${⇔5x+4=x²-4x+4}$ 
    ${⇔x²-4x-5x+4-4=0}$ 
    ${⇔x²-9x=0}$
    ${⇔x(x-9)=0}$
    ${⇔\left[\begin{matrix} x=0\\ x-9=0\end{matrix}\right.}$
    ${⇔\left[\begin{matrix} x=0,ktm\\ x=9,tm\end{matrix}\right.}$
    $\text{Vậy x = 9}$
     

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

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