Set 15: Quadratic Equations (Intermediate)

Choice A is correct. Choice A is the correct answer. Multiplying the output of the function by -1 (i.e., $y = -f(x)$) reflects the graph across the x-axis. 1. $y = x^2$ opens upward. 2. $y = -x^2$ opens downward. Choice B is incorrect because $y = (-x)^2 = x^2$ is the same graph (symmetric over y-axis). Choice C is incorrect because that would be $x^2 - 1$. Choice D is incorrect because the coefficient magnitude is still 1.