Posted by John on Monday, November 21, 2011 at 12:10pm.
I answered before, by completing the square, and told you why the vertex is at (2, -4).
Why don't you just plot the curve yourself?
I understand why the vertex is there, I just don't understand what you mean by completing the square.
http://www.themathpage.com/alg/complete-the-square.htm#complete
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