Add two functions and determine the domain

The video tutorial explains how to combine two functions, F(X) and H(X), by adding them together. It demonstrates the process of simplifying the resulting expression by adding like terms and discusses the domain of the combined function. The tutorial highlights that the domain of the combined function remains all real numbers, as both original functions are quadratic. The video concludes with a brief summary of the key points covered.

What is the domain of the function F of X = X^2 + 4?

How does the domain of the combined function F + H of X relate to the individual domains of F and H?