The impact of a drug is a measure of its effect, for example, the reduction in blood pressure, loss of weight, or the duration of a headache. The impact, I, generally depends on the dose, D, given. ¹ Two possible impact functions, valid for 0D300, are
I = f(D) = D√(300+D) I = g(D) = D√(300-D).
Which function, f or g, has a critical point for D>0?