Please see the graph.
Work Step by Step
$y=-2x^2-1$ vertex: $x = -b/2a$ $x = -0/2*-2$ $x = 0/-4 = 0$ $y=-2*0^2-1$ $y=-2*0-1$ $y=0-1 = -1$ One other point on the curve: $x = 1$ $y=-2*1^2-1$ $y=-2*1-1$ $y=-2-1 = -3$
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