ĐK:\(x\ge0;y\ge1\)
\(\Leftrightarrow\left(x-4\sqrt{x}+4\right)+\left(y-1-6\sqrt{y-1}+9\right)=0\)
\(\Leftrightarrow\left(\sqrt{x}-2\right)^2+\left(\sqrt{y-1}-3\right)^2=0\)
Nhận thấy VT\(\ge0\)\(\forall x,y\) thỏa mãn đk
Dấu "=" xảy ra khi \(\left\{{}\begin{matrix}\sqrt{x}-2=0\\\sqrt{y-1}=3\end{matrix}\right.\)\(\Leftrightarrow\left\{{}\begin{matrix}x=4\\y=10\end{matrix}\right.\)(tm)
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