In a quadrinomial, the four unlike terms are connected by either plus or minus or combination of both signs to form an algebraic expression mathematically. A quadrinomial is also called as a polynomial of four terms and it is possibly formed in two different ways in algebraic mathematics.

Is multinomial a polynomial?

So multinomial is a type of polynomial having more than one terms in it.

What is difference between polynomial and multinomial?

A polynomial is an algebraic expression with 1, 2 or 3 variables, whereas, a multinomial is a type of polynomial with 4 or more variables.