“The vertex is at x = 4,” she said, “because the roots are x = 1 and x = 7, and the roots are symmetric about the vertex.” She used the fact that the parabola is the graph of a quadratic polynomial, ...

How to Graph a Parabola in Word. A parabola is a curved line with particular characteristics. Any point on the curve is the same distance from a fixed point and a fixed straight line.