List three mathematical characteristics of a quadratic function that we talked about and used in class this trimester. Write three sentences. Here are two examples of how the sentences could start:

Step 1 ：One characteristic of a quadratic function is its vertex, which is the highest or lowest point on the parabola.

Step 2 ：Another characteristic we discussed is the axis of symmetry, which is a vertical line that passes through the vertex and divides the parabola into two equal halves.

Step 3 ：Finally, we also used the concept of a parabola, which is the U-shaped curve that represents a quadratic function on a graph.