Which equation has a graph that is a parabola with a vertex at open paren 5 comma 3 close paren ?

A parabola in vertex form is y = (x − h)² + k, where its vertex is (h, k). For a vertex at (5, 3), substitute h = 5 and k = 3 to get y = (x − 5)² + 3. Therefore, choice A is correct.

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