Question

what is a polinomial

Answer 1

a polynomial  has the degree in whole number

Answer 2

An algebraic Expression in which the powers of the variables involved in non-negative integers is called a polynomial.
There are types of polynomials:
i) Monomials, (one term) Example: 5x
ii) Binomials, (two terms) Example: 5x+y
iii) Trinomials, (three terms) Example: x+y+z
iv) polynomials, (more than three terms) Example: x+y+z+a