How do you find the degree of #m^3 n^3 + 6mn^2 - 14m^3n#?
The polynomial is of degree 6.
To find the degree of a multivariable term, you ignore the coefficient and add the exponents of all the variables in that term.
The degree of the polynomial is that of the term with the largest degree.
Your polynomial is
The variables are
The first term has the highest degree, so this is a sixth degree polynomial.