If a quadratic equation has roots , then . Also, two polynomials are equal iff their respective coefficients are equal.

According to my calculations, the answer is "none of the above" because one variant is only a partial, not complete, answer.

In typing polynomials in ASCII, it is customary to indicate power using ^, e.g.: x^2 + ax + 4. You can also use LaTeX: type [tex]x^2+ax+4[/tex] and [tex]\sqrt{2}[/tex] to get and .