Assertion: parabola | /r/HasAspect | maximum value
Facets:
Source sentences:
text: When you look at the parabola if it opens downwards then the parabola has a maximum value (because it is the highest point on the graph) if it opens upward then the parabola has a minimum value (because it's the lowest possible point on the graph)
text: Because a is negative, the parabola opens downward and has a maximum value.