
Arturo O. answered 07/04/18
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One example is to make (-5,-1) the vertex of a concave-down parabola.
y = a(x - h)2 + k
h = -5
k = -1
a = any negative number, to ensure the parabola is concave-down. You can pick a = -1.
y = -(x + 5)2 - 1