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A parabola intersects the x-axis at x = 3 and x = 9. What is the x-coordinate of the parabola's vertex?
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4 votes
A parabola intersects the x-axis at x = 3 and x = 9.

What is the x-coordinate of the parabola's vertex?

User Roland Schaer
by
8.5k points

1 Answer

4 votes
The vertex is exactly in the middle of the two intersections with the x axis.
So, it's in the middle of x=3 and x=9.

What's the middle of 3 and 9? You can find this by calculating the average.
(3+9)/2 = 6
So, the vertex is at x = 6.
User Kirill Pashkov
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8.0k points
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