Find the equation of a downward-opening parabola with a given vertex.
\( \text{What is the equation of a parabola that opens downward and has vertex } (0, 5)? \)
Choose one option:
Identify h and k from the vertex, set a negative for downward opening.
In vertex form, y = a(x-h)^2 + k, a < 0 gives downward opening, (h,k) is the vertex.
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