Which statement best describes the effect on the graph of y is equal to open paren x minus 9 close paren squared if the equation is changed to y is equal to open paren x plus 9 close paren squared ?

The graph of y = (x − 9)² has its vertex at (9, 0), while y = (x + 9)² has its vertex at (−9, 0). The vertex moves 18 units left, so the graph moves left 18 units. The correct choice is “The graph moves left 18 units.”

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