G(x) is undefined when x=−3 and x=1 since these are the values that would make the denominator zero.
The function you've provided is

To work with this function, let's first factorize the denominator to simplify it.
The denominator, x^2 +2x−3, can be factorized as
(x+3)(x−1). Therefore, the function becomes:
G(x)=

This function is defined for all real numbers except where the denominator becomes zero (as division by zero is undefined). So,
G(x) is undefined when x=−3 and x=1 since these are the values that would make the denominator zero.