Posted by Randy on Saturday, May 8, 2010 at 12:23am.
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 = 2x10
y^2 + 4y + 4 = 2x6
(y+2)^2= 2(x+3)
vertex: (3, 2)
Focus: (3.5, 2)
Directrix: 2.5

Precal  Reiny, Saturday, May 8, 2010 at 12:31am
I agree
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