Final answer:
Without the precise definition or formula for function g, it is impossible to determine the values of g(-5), g(1), and g(2). More information about the function is needed to compute these values.
Step-by-step explanation:
To determine the value of g(-5), g(1), and g(2), the function g must be provided or described, which it is not in the provided text. However, you've given some clues that might relate to how g is calculated. For instance, you've mentioned subtracting positive and negative numbers, but without a clear definition of function g, we cannot accurately compute its values for specific inputs. We'd need the exact rule or formula that defines g(x) to proceed.
If details about how to calculate g(x) are missing or incorrect, you may need to check the original problem or rephrase your question, providing the correct information about the function.