How do you determine if #21# is a polynomial and if so, how do you identify if it is a monomial, binomial, or trinomial?
Look for the number of terms that are separated by + or - signs.
If 21 would written as
A monomial has only one term. Everything can be combine without a plus or a minus sign. such as 4x (
A binomial has two terms. There are unlike terms that cannot be combined. such as x + 4 there is one plus or minus sign.
A trinomial has three terms. There are three unlike terms that can not be combines such