How to use the difference of two squares to evaluate the limit by substitution

The video tutorial explains the process of handling zero in the denominator during substitution. It covers graphing and algebraic properties, focusing on factoring the numerator into the difference of two squares. After simplification, direct substitution is applied to evaluate the expression, leading to the final result.

How can direct substitution be applied in evaluating expressions?

What result do you get when you plug in -2 for X in the given expression?