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)

asked Feb 2, 2019 13.8k views

0 votes

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)

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7 votes

$y=√(x^2-1)\\\\The\ domain:\\\\x^2-1\geq0\ \ \ |+1\\\\x^2\geq1\iff x\geq1\ \vee\ x\leq-1\to|x|\geq1\\\\Answer:\ a.\ |x|\geq1$

JosephT answered Feb 4, 2019

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2 votes

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

The correct option is a

Leze answered Feb 8, 2019

by Leze

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