1) ООФ:
0\\
x^2>9\\
\left \{ {{x> \sqrt{9} } \atop {x<- \sqrt{9} }} \right. \ \ \ \left \{ {{x> 3 } \atop {x<- 3 }} \right." alt="x^2-9>0\\
x^2>9\\
\left \{ {{x> \sqrt{9} } \atop {x<- \sqrt{9} }} \right. \ \ \ \left \{ {{x> 3 } \atop {x<- 3 }} \right." align="absmiddle" class="latex-formula">
Ответ: х ∈ (-бескон; -3) U (3; +бескон)
2) ООФ:
0\\
-x^2>-25\\
x^2<25\\
\left \{ {{x<5} \atop {x>-5}} \right. " alt="25-x^2>0\\
-x^2>-25\\
x^2<25\\
\left \{ {{x<5} \atop {x>-5}} \right. " align="absmiddle" class="latex-formula">
Ответ: (-5; 5)