\(\sqrt{x^2-9}-3\sqrt{x-3}=0\) \(đk:x\ge0\)
\(\sqrt{\left(x-3\right)\left(x+3\right)}-3\sqrt{x-3}=0\)
\(\sqrt{x-3}\cdot\left(\sqrt{x+3}-3\right)=0\)
\(\left[{}\begin{matrix}\sqrt{x-3}=0\\\sqrt{x+3}-3=0\end{matrix}\right.\left[{}\begin{matrix}x-3=0\\\sqrt{x+3}=3\end{matrix}\right.\left[{}\begin{matrix}x=3\left(tm\right)\\x+3=9\left(tm\right)\\x+3=-9\left(ktm\right)\end{matrix}\right.\left[{}\begin{matrix}x=3\left(tm\right)\\x=6\left(tm\right)\end{matrix}\right.\)
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