When working with quadratics, the usual formula for working with them is as a trinomial where ax2+bx+c=0. The 'a' 'b' and 'c' are simply coefficients that may or may not be in the formula.
If there is no number in front of one or the other of the variables, then the coefficient is assumed to be '1'. The 'c' term is the positive or negative number at the end of the trinomial. If there is not a middle term, 'b', then the coefficient MUST be zero, and it is eliminated from the trinomial.
Is this enough information? Please let me know if it isn't. Thanks!