The video tutorial explains how to evaluate a function relationship. It begins with an introduction to the concept of function relationships, followed by a detailed walkthrough of evaluating a specific function, H, at a given value, T=2. The process involves substituting the value into the function and simplifying the expression. The tutorial then extends this evaluation to a binomial expression, X+2, demonstrating the substitution and simplification steps. The video emphasizes understanding the parts of a function and the importance of correctly substituting values to evaluate functions accurately.

Explain the process of substituting values into a function.

What is the final expression for H at X + 2 after simplification?