My Math Forum Identify the vertex, focus and the directrix

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 May 7th, 2010, 03:41 PM #1 Member   Joined: Sep 2009 Posts: 43 Thanks: 0 Identify the vertex, focus and the directrix Sketech the graph of the equation y^2+4y+2x+10=0. Identify the vertex, the focus and the equation for the directrix. Use the completing the square to put the equation into standard form as your first step. This is what I did. y^2 + 4y = -2x-10 y^2 + 4y + 4 = -2x-6 (y+2)^2= -2(x+3) vertex: (-3, -2) Focus: (-3.5, -2) Directrix: -2.5
 May 7th, 2010, 09:37 PM #2 Global Moderator     Joined: Nov 2009 From: Northwest Arkansas Posts: 2,767 Thanks: 5 Re: Identify the vertex, focus and the directrix Perfect.
May 18th, 2010, 04:19 PM   #3
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Re: Identify the vertex, focus and the directrix

Quote:
 Originally Posted by The Chaz Perfect.
In subtlety, maybe.

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