SOLUTION: Solve this by graphing: x^2 +2x - 8 = 0 I had tried to graph this for several hours, but I still can't figure it out.

Algebra ->  Graphs -> SOLUTION: Solve this by graphing: x^2 +2x - 8 = 0 I had tried to graph this for several hours, but I still can't figure it out.      Log On


   

Question 668975: Solve this by graphing: x^2 +2x - 8 = 0
I had tried to graph this for several hours, but I still can't figure it out.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

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 ⇒   (x+1)^2 = 9, x = -1 ± 3, Pt(2,0) & (-4,0) are the x-intercepts