Question 468293
  <pre><font face = "Tohoma" size = 4 color = "indigo"><b> 
Hi,
the vertex form of a parabola, {{{y=a(x-h)^2 +k}}} where(h,k) is the vertex
f(x)= -4(x+7)^2+8   V(-7,8) a maximum, parabola opens downward a = -4 a <0
                   Line of symmetry is x = -7
 
f(x)= -(x+6)^2-7   V(-6,-7) a maximum, parabola opens downward a = -1 a <0
                   Line of symmetry is x = -6


{{{drawing(300,300,-10,10,-10,10 ,blue(line(-7,10,-7,-10)),blue(line(-6,10,-6,-10))   ,grid(1),
circle(-7, 8,0.3),
circle(-6, -7,0.3),
graph(300,300,-10,10,-10,10,0,-4(x+7)^2+8,-(x+6)^2-7  ))}}}