Evaluating functions with a monomial

The video tutorial explains how to evaluate a polynomial function P(x) = 4x^2 - 3 for a variable expression, specifically a squared (a^2). The instructor guides through substituting a^2 for x in the function, resulting in the expression 4a^4 - 3. The process involves understanding the power of a power rule and simplifying the expression. The tutorial concludes with the final evaluated expression.

What new insight or understanding did you gain from this video?