Question

Which will be the effect on the vertex of the parabola y = 4x2 + 1, if the equation is changed to y = -4x2 + 1?

Answer 1

The Gradient would be negative therefore making it start by going down then up, making a sad mouth. the x intercepts will be the same. Frankly it just flipped upside down. I remember it like if the gradient is positive then happy smile, if its negative then sad smile. Hope I helped.