Posted by **John** on Monday, November 21, 2011 at 12:10pm.

How to graph this:

Step 0: y=x(x-4)

Step 1: y=x^2-4x

What's next?

Calculator shows vertex at (2,-4)

I asked before, but I'm still stuck. Please help. thanks.

- Math (URGENT) -
**drwls**, Monday, November 21, 2011 at 12:39pm
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?

- Math (URGENT) -
**John**, Monday, November 21, 2011 at 12:46pm
I understand why the vertex is there, I just don't understand what you mean by completing the square.

- Math (URGENT) -
**drwls**, Monday, November 21, 2011 at 12:51pm
http://www.themathpage.com/alg/complete-the-square.htm#complete

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