Question 389606
  <pre><font size = 3 color = "indigo"><b>
Hi,         
Note: roots of an equation are found when y = 0
     x^2 - 2x - 8 = 0
  Factoring
(x-4)(x+2) = 0 Note:SUM of the inner product(-4x) and the outer product(2x) = -2x  
(x-4) = 0     x = 4
(x+2) = 0     x = -2
 {{{drawing(300,300, -6, 6, -6, 6, grid(1),
circle(4, 0,0.3),
circle(-2, 0,0.3),
graph( 300, 300, -6, 6, -6, 6,x^2-2x - 8))}}}