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Identify the vertex of the graph tell wether it is a minimum or maximum

Identify the vertex of the graph tell wether it is a minimum or maximum-example-1
User Partiz
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6 votes
-1  ,  1 ..........................................................
User Marinka
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The vertex is at (1,-1), and it is a minimum. The vertex is the point where the graph changes direction, so that is why the vertex of this problem is (1,-1).
User Vendettacore
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