2x+1 calssify as minomial binomial trinomial polynomial constant

Depending on how much numbers or variables you have is the way you can identify how many terms there is, for example in here we have 2 sets of terms this means this is classified as a binomial
Bi means 2 mono means 1 tri means 3 and poly means many

when u have only 1 terms for example 3x that is a monomial if you have 2 like in this case its a binomial if you had 3 for example 3x+5y+8 that is a trinomial because it has 3 terms but if you have 3x^2+7x+1 you now have a polynomial because the x its set to the 2 power

Hope this helps