Answer:
Explanation:
A function has a domain and a range.
The domain is the range of values of x that the function can take as input.
For example:
f(x) = x / (x - 1)
Now x can have every value except 1 because the denominator (x - 1) is 0 if x = 1. That would give us 1/0 which is undefined so f(x) can't 'take' x = 1 as input.
The domain of f(x) is therefor All real values of x except x = 1.
In interval notation it is
(-∝, ∝) x not = 1
(∝ means infinity)