Why aren’t the following polynomials? y=x^2 +2^x y^2=(x-2)^2-1 y=1/x^2+1/x+1/2

Polynomials can have constants (3, -9), variables (x, y), and exponents (). One thing you can't have is a variable in the denominator. For example:

Or fractional exponents.

Step-by-step explanation:

a)  

Is not a polynomial because does not have the standard form, where variable is the base. e.g.

b)  

Is not a polynomial because has fractional exponents

c)  

Is not a polynomial because our variable x is in the denominator

the answer is b