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![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
$\begin{array}{l}
3{y^2} + 1 + 2y(x + 1) = 4y\sqrt {{x^2} + 2y + 1} \\
y(y - x) = 3 - 3y \\
\end{array}$
3{y^2} + 1 + 2y(x + 1) = 4y\sqrt {{x^2} + 2y + 1} \\
y(y - x) = 3 - 3y \\
\end{array}$