`x+7sqrt(x)-8=0`
`<=>x-sqrt(x)+8sqrt(x)-8=0`
`<=>(x-sqrt(x))+(8sqrt(x)-8)=0`
`<=>sqrt(x)(sqrt(x)-1)+8(sqrt(x)-1)=0`
`<=>(sqrt(x)-1)(sqrt(x)+8)=0`
`<=>`\(\left[ \begin{array}{l}\sqrt{x}-1=0\\\sqrt{x}+8=0\end{array} \right.\)
`<=>`\(\left[ \begin{array}{l}\sqrt{x}=1\\\sqrt{x}=-8\end{array} \right.\)
`<=>`\(\left[ \begin{array}{l}x=1\\x∈∅\end{array} \right.\)
xin hay nhất