8 = 8 times x raised to the zero, so it could be considered a zero order polynomial.
Typically polynomials have multiple terms, though.
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That varies from polynomial to polynomial. Whatever the highest exponent is is called the "degree", so a quadratic like x2 + 2x + 8 has degree 2.
You can evaluate a polynomial, you can factorise a polynomial, you can solve a polynomial equation. But a polynomial is not a specific question so it cannot be answered.
A 7th degree polynomial.
It is a quadratic polynomial with integer coefficients..