Which expressions are polynomials?

select each correct answer.

x2+5x15

−x2+5x

6x² + 5x

−7x2+53x

They all are polynomials.

Step-by-step explanation:

Given : Following expression

1)  

2)  

3)

4)

The following all are polynomials because polynomials are:

An expression consisting of variables and coefficients or expression more than two algebraic terms and the terms that contain different powers of the same variable(s) involve operations addition , subtraction, multiplication and non-negative integer exponent of variables.

So when we see to these functions they all are a mixture of a polynomial.