![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1437988/original_63.JPG)
The above picture are few natural examples of parabolic shape which is represented by a quadratic polynomial. A parabolic arch is an arch in the shape of a parabola. In structures, their curve represents an efficient method of load, and so can be found in bridges and in architecture in a variety of forms.
Based on the above information, answer the following questions.
If the parabolic arch is represented by a polynomial
ax2+bx+c, which of the following is mandatory?