Given the equation y=−10x2+20x+80 with solutions of x=−2 and x=4 , which of the following identifies the general shape of its associated graph?(1 point)
1. The graph touches the x-axis exactly one time.
2. The vertex is to the left of the y -axis.
3. The graph opens upward.
4. The graph opens downward.
The correct answer is:
3. The graph opens upward.