F (x) = 7-2x polynomial function

Step-by-step explanation:

Yes, F (x) = 7-2x is a polynomial function for which the sole x term has the exponent 1 and the constant term has the exponent 0:

F (x) = - 2x^1 + 7x^0

As is true of all polynomial functions, the exponents are all positive integers (plus that of the constant term is zero).