Which statement best describes the effect on the graph of y = (x – 9)2 if the equation is changed to y = (x + 9)2?

In vertex form, y = (x − h)² has its vertex at (h, 0). The first graph has vertex (9, 0), and y = (x + 9)² = (x − (−9))² has vertex (−9, 0). Moving from x = 9 to x = −9 is 18 units left, so the graph moves left 18 units.

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