Making sense of William Jones's solution of quadratic equations and notation
William Jones, when discussing quadratic equations, says: "Therefore if be put for the Sign of any Term, and ∧ for the contrary, all Forms of Quadratics with their Solutions, will be reduc'd to this one. If then ."
Could you please help me make sense:
(a) What is meant with "the contrary" of "any sign"?
(b) Do I understand correctly that the "then" part supposed to be a solution to the preceding quadratic equation? If yes, how does this work exactly? How does it align with how we would symbolize the solution today?