SOLUTION: I have to find the line of symmetry equation for a graph. The equation was vertex is (-2,-9) and minimum parabola. Can you help me to find the equation for this line of symmetry?

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Question 121202: I have to find the line of symmetry equation for a graph. The equation was vertex is (-2,-9) and minimum parabola. Can you help me to find the equation for this line of symmetry?
The equation was:
x(sq)+4x-5=0
There is no ISBN number on this it is an online course.
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
the axis of symmetry passes through the vertex

since the x is the squared variable, the axis of symmetry is parallel to the y-axis

so the equation is x=-2

for the general expression ax^2+bx+c, the equation for the axis of symmetry is x=-b/(2a)