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I need help.

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A quadratic of the form $$-2x^2 + bx + c$$ has roots of $$x = 3 + \sqrt{5}$$ and $$x = 3 - \sqrt{5}.$$ The graph of $$y = -2x^2 + bx + c$$ is a parabola. Find the vertex of this parabola.

I don't know where to start with this, let alone solve it.

Can someone please explain to me?