\(\Leftrightarrow\left(x+y\right)^2+7\left(x+y\right)+\frac{49}{4}-\frac{9}{4}+y^2=0\)
\(\Leftrightarrow\left(x+y+\frac{7}{2}\right)^2=\frac{9}{4}-y^2\)
\(\Rightarrow y^2\le\frac{9}{4}\Rightarrow-\frac{3}{2}\le y\le\frac{3}{2}\)
Mà y nguyên \(\Rightarrow y=\left\{-1;0;1\right\}\)
- Với \(y=-1\Rightarrow x^2+5x+5=0\) ko có x nguyên t/m
- Với \(y=0\Rightarrow x^2+7x+10=0\Rightarrow\left[{}\begin{matrix}x=-2\\x=-5\end{matrix}\right.\)
- Với \(y=1\Rightarrow x^2+9x+19=0\) ko có x nguyên t/m