\(ĐK:x\ge5\)
\(\Leftrightarrow\sqrt{4\left(x-5\right)}+\sqrt{x-5}=6\)
\(\Leftrightarrow2\sqrt{x-5}+\sqrt{x-5}=6\)
\(\Leftrightarrow3\sqrt{x-5}=6\)
\(\Leftrightarrow\sqrt{x-5}=2\)
\(\Leftrightarrow x-5=4\)
\(\Leftrightarrow x=9\) (tm)
S = {9}
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\(\sqrt{4x-20}\) +\(\sqrt{x-5}\)=6
\(\sqrt{4\left(x-5\right)}\) + \(\sqrt{x-5}\) = 6
2\(\sqrt{x-5}\) + \(\sqrt{x-5}\) =6
3\(\sqrt{x-5}\) =6
\(\sqrt{x-5}\) =2
x - 5 = 4
x =9
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