Set 3: Quadratic Equations (Intermediate)

Choice A is correct. Choice A is the correct answer. The discriminant determines the number of real roots. * $\Delta > 0$: Two distinct roots (crosses twice). * $\Delta = 0$: One repeated root (touches once). * $\Delta < 0$: No real roots (does not cross). Choice B is incorrect because that requires positive discriminant. Choice C is incorrect because that requires negative discriminant. Choice D is incorrect because it is quadratic.