Choose the correct quadratic equation given its vertex and opening direction.
\( \text{Which of these equations has vertex at } (1, -2) \text{ and opens downward?} \)
Select all correct options:
Identify the vertex, use vertex form, then choose negative a for downward opening.
Vertex form: \(y = a(x - h)^2 + k\). Downward opening requires \(a < 0\).
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