, with:

"a" being 6

"b" being - 36, and

"c" being + 59

The x-coordinate of the vertex is at:  

Therefore, we get: , or , or 



In an earlier post, you'd asked for the y-coordinate of the vertex, but failed to post the correct equation.

You'd need to substitute 3 for x in  to obtain the y-coordinate of the vertex. 

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