\(x^2+2xy+y^2+4x^2-4x+1=41\)
\(\Leftrightarrow\left(x+y\right)^2+\left(2x-1\right)^2=41=4^2+5^2\)
\(\Rightarrow\left[{}\begin{matrix}\left\{{}\begin{matrix}\left(x+y\right)^2=4^2\\\left(2x-1\right)^2=5^2\end{matrix}\right.\\\left\{{}\begin{matrix}\left(x+y\right)^2=5^2\\\left(2x-1\right)^2=4^2\end{matrix}\right.\end{matrix}\right.\)
Bạn tự giải nốt