Question 632667
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
f(x) = -2(x+3)^2  
V(-3,0) and line of symmetry is x = -3
Note: the vertex form of a Parabola opening up(a>0) or down(a<0), {{{y=a(x-h)^2 +k}}} 
where(h,k) is the vertex  and  x = h  is the Line of Symmetry
{{{drawing(300,300,   -6, 6, -6, 6,  blue(line(-3,6,-3,-6))  , grid(1),
circle(-3, 0,0.3),
graph( 300, 300, -6, 6, -6, 6,0,-2(x+3)^2  ))}}}