Write the equation of an upward-opening parabola given its vertex.
\( \text{Write the equation of a parabola with vertex } (0, -4) \text{ and opens upwards.} \)
Choose one option:
Plug in h, k, a into vertex form to get the equation.
Vertex form: \(y = a(x - h)^2 + k\). Substitute \(h = 0, k = -4, a = 1\).
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