Set 6: Quadratic Equations

Choice A is correct. Choice A is the correct answer. 1. Discriminant: $2^2 - 4(1)(5) = 4 - 20 = -16$. 2. Since $\Delta < 0$, there are no real roots. 3. Parabola opens upward ($a=1$). 4. It is entirely above the x-axis, so it is never less than 0. Choice B is incorrect. Choice C is incorrect. Choice D is incorrect.