Answer:
Upward or Downward
Step-by-step explanation:
A parabola is the graph of a quadratic function y = ax2 + bx + c. The graphs below depict two typical parabolas:
For clarity, we indicate their x-intercepts with red dots, their y-intercepts with pink dots, and the vertex of each parabola with a green dot:
The first parabola (a U shape) opens vertically, whereas the second parabola opens downwards (is an upside down U shape).
Given the function y = ax2 + bx + c, write the following:
- <em>If an is greater than zero (positive), the parabola widens upward.</em>
- <em>If the value is 0 (negative), the parabola expands downward.</em>
