Determine which expressions are polynomials. explain your reasoning.

For this case we have that a polynomial is of the form:

Where:

a, b, c, d, e, f: They are the coefficients

n, n-1,3,2,1: They are the exponents, where n is to the degree of the polynomial because it is the largest.

x: It is the variable.

So, we have to:

is a polynomial of degree 5.

answer: the first graph

step-by-step explanation: