SOLUTION: Quadratic Relations 39) The vertex of a parabola is (-2,-4). One x-intercept is 7. What is the other x-intercept? (PLEASE) Thank you very muchhhhhhhhhhhh

Question 178078: Quadratic Relations
39) The vertex of a parabola is (-2,-4). One x-intercept is 7. What is the other x-intercept? (PLEASE)
Thank you very muchhhhhhhhhhhh
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
I know that the x co-ordinate of the vertex is midway between the
2 x-intercepts, so I can use the formula

I'm told that the vertex is at (-2,-4), so ,
and also given is

The other x-intercept is at x = -11
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