Question 429642
  <pre><font face = "Tohoma" size = 4 color = "indigo"><b>
Hi, You are exactly correct!
The standard form (opening rt or left) is {{{(y -k)^2 = 4p(x -h)}}}, where  the focus is (h,k + p) 
Directrix x = 4  Vertex: (7,-2) then p = 3  
{{{(y+2)^2 = 12(x -7)}}} 
{{{drawing(300,300, -15,15,-15,15, blue(line(4,15,4,-15)), grid(1),
circle(7,-2,0.5),
circle(10,-2,0.5),
graph( 300, 300, -15,15,-15,15,0,-2,sqrt(x-7)-2, -sqrt(x-7)-2 ))}}}