Charla wants to determine the vertex of the function f(x) = x2 – 18x + 60 by changing the function into vertex form. Which statement about the vertex of the function is true?

Complete the square: x² − 18x + 60 = (x − 9)² − 21, so the vertex is (9, −21). Its x-coordinate, 9, is greater than its y-coordinate, −21, so the true statement is that the x-coordinate of the vertex is greater than the y-coordinate.

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