Determine if the expression 4m^5-6m^8 is a polynomial in one variable. If so, state the degree.

Question

I really don't understand how to do this, and I can find it in my pre-calculus book.

Answer 1

There is only one variable, m
There is more than one term, one in m^5 and one in m^8, so it is polynomial not monomial.
The highest degree is 8 so it is of eighth degree.