Question 1167819
This is also x^2+2x-8 or (x^2+2x+1-9) or (x+1)^2-9 which has the vertex at (-1, -9)
the y-intercept is the constant (0, -8)
x-intercepts are at x=-4 and x=2
axis of symmetry is between the roots exactly at x=-1

{{{graph(300,300,-10,10,-10,10,(x+4)(x-2))}}}