How to add two functions

The video tutorial introduces function notation and its similarity to polynomials. It defines two functions, F(x) and G(x), and demonstrates how to perform operations on them, specifically addition. The tutorial explains the process of evaluating F + G of X, emphasizing the importance of parentheses and combining like terms. The session concludes with a summary of the addition process and its basic principles.

Why are parentheses important when evaluating functions?

What does the teacher mean by 'a negative is the same thing as subtracting' in the context of function addition?