Question

A parabola intersects the X-axis at X

= 3 and x= 9.
What is the x-coordinate of the parabola's vertex?

Answer 1

x = 6

Explanation:

The vertex lies on the axis of symmetry which is situated midway between the x- intercepts, thus x- coordinate of vertex is

`x_(vertex)` =
`(3+9)/(2)` =
`(12)/(2)` = 6