What is the domain of g (x)=1-2x^2

Given Equation => g(x) = 2x – 1
Now, the problem is we need to find the domain of g.
I believe that all domain are real numbers. Thus, let’s start finding the domain of g

Let’s try -1 as the value of x
=> g(x) = 2x – 1
=> g (-1) = 2 (-1) -1
=> g (-1) = -2 -1
=> g (-1) = -3
Therefore, if the value of x is -1, the domain value of g(x) is -3

Let’s try 2 as value of x
=>=> g(x) = 2x – 1
=> g (2) = 2 (2) -1
=> g (2) = 4 -1
=> g (2) = 3
Therefore, if the value of x is 2, the domain value of g(x) is 2