\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
For the quadratic function \(f(x) = 2x^2 + 4x - 1\), find:
  1. The direction of opening (concavity).
  2. The coordinates of the y-intercept.
  3. The equation of the axis of symmetry.
  4. The coordinates of the vertex.

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