In the picture above, the main shape is called a

**parabola**. It is drawn on a coordinate plane. It shows a

**quadratic formula** which is represented by the

**equation** .

When you draw what a formula represents, it is called a **graph**. Notice how it is **decreasing** on the left side and **increasing** on the right side. C is the **vertex**. In the picture above, Line A is **parallel** to the **x-axis** and perpendicular to the **y-axis**. The y-axis is also the **axis of symmetry**. This means that the left side of the y-axis is symmetrical to the right side. If you took the picture above and folded the paper on the y-axis, the pictures would be identical.

A

**function** must have a one-to-one relationship. So, for every solution in y, there can only be one solution in x.