The expressions that are polynomial are:
6 + w
![2x^4 - y](/tpl/images/0521/9741/41070.png)
z + 1
Solution:
A polynomial is an expression with variables and coefficients with the operations of addition, subtraction, multiplication, and non-negative integer exponents of variables
1) 6 + w
Here "w" is a variable, hence it is a polynomial expression
![2)\ 2x^4 - y](/tpl/images/0521/9741/cdf33.png)
This is a polynomial, since it has variables and coefficients and variable with non negative exponent
3) z + 1
This is also a polynomial with variable "z" and has addition operation
![4)\ y^2 - y\sqrt{3} + 4](/tpl/images/0521/9741/2c2ee.png)
Since it has root so it is not a polynomial