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

Answer:

x = 6

Step-by-step explanation:

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

$x_{vertex}$ = $\frac{3+9}{2}$ = $\frac{12}{2}$ = 6