Question 668975
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
y = x^2 +2x - 8 
y = x^2 +2x +1 - 1 - 8 
y = (x+1)^2 - 9  V(-1,-9) and line of symmetry is x = -1
and when y  = 0 &#8658;   (x+1)^2 = 9, x = -1 ± 3, Pt(2,0) & (-4,0) are the x-intercepts
{{{drawing(300,300,   -6, 6, -10, 6,  blue(line(-1,10,-1,-10))  , grid(1),
circle(2, 0,0.3),
circle(0, -8,0.3),
circle(-4, 0,0.3),
circle(-1, -9,0.3),
graph( 300, 300, -6, 6, -10, 6,0,x^2 +2x - 8  ))}}}