Classifying a polynomial when it appears to be rational

The video tutorial explains how to classify a polynomial, determine its leading coefficient, and identify its degree. It begins by discussing the rules for identifying polynomials, such as ensuring no variables are in the denominator. The tutorial then demonstrates rewriting a given expression to a more familiar polynomial form, allowing for the identification of the leading term and its coefficient. The degree of the polynomial is determined by the highest power of the leading term. The tutorial concludes by summarizing the classification process and confirming the polynomial's degree and leading coefficient.

Explain why the given expression is classified as a cubic polynomial.

What does it mean for a polynomial to be a trinomial?