Suppose I ask a question which includes a mistaken calculation, such that if the calculation were to be corrected, the question would be uninteresting. The question receives an answer, indicating the mistake, and correctly solving the original equation. This is the question I have in mind: Quadratic Formula With Independent and Dependent Variables
Editing the question by correcting the integration would eclipse the most interesting part, as the result is not quadratic. Should the question be edited in a way that preserves the original mistake, as it currently does, or should the original differential equation be changed so that it does integrate to a quadratic equation, even though it would make the current answer invalid?