# Turning Point?

1. Mar 1, 2009

### Michael17

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

2. Mar 2, 2009

### Gib Z

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

3. Mar 2, 2009

### HallsofIvy

That's assuming that the quadratic is y= ax2[/sub]+ bx+ c!

You can find the turning point (vertex) by completing the square.

4. Mar 2, 2009

### The Bob

Or by 2nd order differentiation.

The Bob