Finding the symmetry point in a quadratic graph [duplicate]

How do I find the symmetry point for a graph based on a quadratic equation?

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marked as duplicate by Meta, Daniel W. Farlow, Joel Reyes Noche, Najib Idrissi, vociferous_rutabagaMar 31 '15 at 8:35

For an equation of the form $y= ax^2 + bx + c$ the axis of symmetry lies on the x-value $\frac{-b}{2a}\$.