Question

What is the domain for the following function?

y=(4)/(x²+1)

a. {all real numbers}
b. {x≠-3}
c. {x≠3}
d.{x≠0}

Answer 1

A. all real numbers

Answer 2

solve: set denominator equal to 0

x^2 +1 = 0
x^2 = -1
No real solution

Therefore no restriction on Domain

Answer 3

all real numbers

Answer 4

A. all real numbers

Answer 5

A. all real numbers

Answer 6

The first minute of this video provides reinforcement of the concept:
http://www.youtube.com/watch?v=sbvSBH2Mo20