Polynomials are algebraic expressions involving one, or even more than one variables raised to any power summing each other. Generally speaking, in other words an one variable Polynomial is
So a multivariate polynomial expression are and 6y²+ 5x.
Because in the other options:
We have a Radical of an Irrational number times x (2nd option) what does not configure a polynomial.
And a Polynomial Quotient with a variable on the denominator, described by: