Question 409517
  <pre><font size = 3 color = "indigo"><b>
Hi
sketching parabola: Format: (y-k)^2 = 4p(x-h)
I. Vertex is Pt(0,0)
II. Opens left.  Line of symmetry is the x-axis
III. Directrix is x = 5  -p = 5  OR p = -5  and 4p = -20
 y^2 = -20x   OR  x = (-1/20)y^2
{{{drawing(300,300,    -10,10,-10,10,blue(line(5,10,5,-10)),     grid(1),
circle(0, 0,0.3),
circle(-5, 0,0.3),
graph( 300, 300,-10,10,-10,10,0,sqrt(-20x),-1sqrt(-20x)))}}}