Respuesta :

We will solve as follows:

[tex]x^2-9=-1\Rightarrow x^2=9-1[/tex][tex]\Rightarrow x^2=8\Rightarrow x=\sqrt[]{8}[/tex][tex]\Rightarrow x=\sqrt[]{4\cdot2}\Rightarrow x=2\sqrt[]{2}[/tex]

So, x = 2*sqrt(2).