Respuesta :

Hi there!

The x-coordinate of the vertex is the mean, or average of the x-intercepts of the parabola.

Let's take the mean of 3 and 9, which are the x-intercepts.

[tex] \frac{3+9}{2} [/tex]

[tex]= \frac{12}{2} [/tex]

[tex]=6[/tex]

That's your answer.

Have an awesome day! :)

~AgentCozmo4, Junior Moderator
The x coordinate of the parabola will be  halfway between x = 3 and x = 9

That is at x = 6.