Respuesta :

x can be -1 or 1 for the square root to be 0 

The correct option is a
gmany
[tex]y=\sqrt{x^2-1}\\\\The\ domain:\\\\x^2-1\geq0\ \ \ |+1\\\\x^2\geq1\iff x\geq1\ \vee\ x\leq-1\to|x|\geq1\\\\Answer:\ a.\ |x|\geq1[/tex]

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