What are the coordinates of the vertex for the quadratic function below?

Thanks LagTho,

Suggesting a graphing calc was a good idea but you have not told guest where to find one or how to use it!

Also a vertex is a co-ordinate, it needs 2 numbers, with brackets, not just one number.

 

This is the best online graphing calc around 

Guest, you can just put your graph equation straight in on the left hand side.

 

https://www.desmos.com/calculator