# A parabola has x-intercepts x= 3 and x= -9. How do you determine the equation of the axis of symmetry for the parabola?

##### 1 Answer

x = - 3

#### Explanation:

Call x the x-coordinate of the parabola axis of symmetry:

Call x1 = 3 and x2 = -9, the two x-intercepts.

The coordinate of the of the parabola 's axis of symmetry is: