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