Determine if the parabola opens up or down.
Vertex: (0,−21); Axis of symmetry: x=0; Domain: (−∞,∞); Range: (−∞,−21]
Vertex: (0,21); Axis of symmetry: x=0; Domain: (−∞,∞); Range:[−21,∞)
Vertex: (0,−21); Axis of symmetry: x=−1; Domain: (−∞,∞); Range:[−21,∞)
Vertex: (0,−21); Axis of symmetry: x=−1; Domain: (−∞,∞); Range: (−∞,21]
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