Forget No More: How to Find a Turning Point in a Quadratic Graph

[Michael17]

I seem to have forgotten the rule to find a Turning point in a quadratic graph. Can anyone help me?

 

[Gib Z]

The turning point on a quadratic graph is at the vertex, whose x-coordinate is given by $$x=\frac{-b}{2a}$$

 

[HallsofIvy]

That's assuming that the quadratic is y= ax<sup>2[/sub]+ bx+ c!

You can find the turning point (vertex) by completing the square.</sup>

 

[The Bob]

Or by 2nd order differentiation.

The Bob