$$( x - a ) ( x + a ) = x ^ { 2 } - a ^ { 2 } ( b ^ { 2 } - 5 ^ { 2 }$$
$\left\{\begin{matrix}\\a=0\text{, }&\text{unconditionally}\\a\in \mathrm{C}\text{, }&b=-\sqrt{26}\text{ or }b=\sqrt{26}\end{matrix}\right.$
$\left\{\begin{matrix}\\b=-\sqrt{26}\text{; }b=\sqrt{26}\text{, }&\text{unconditionally}\\b\in \mathrm{C}\text{, }&a=0\end{matrix}\right.$
$\left\{\begin{matrix}\\a=0\text{, }&\text{unconditionally}\\a\in \mathrm{R}\text{, }&|b|=\sqrt{26}\end{matrix}\right.$
$\left\{\begin{matrix}\\b=\sqrt{26}\text{; }b=-\sqrt{26}\text{, }&\text{unconditionally}\\b\in \mathrm{R}\text{, }&a=0\end{matrix}\right.$
