Question

What is the domain of y = √x^2-1?

a. IxI>_1
b. x>_1
c. x>_0
d. all real numbers
(x_= more/less than or equal too)

Answer 1

`y=√(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`

Answer 2

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

The correct option is a