Question: Determine whether each function's vertex is a maximum point or a minimum point and find the coordinates of this point. Find the zeros, if any

Determine whether each function's vertex is a maximum point or a minimum point and find the coordinates of this point. Find the zeros, if any exist, and the y-intercept. Then sketch the graph of the function.

1. y = x - ¼ x2

2. y = - 2x2 + 18x

3. y = x2 + 4x + 4

4. y = x2 - 6x + 9

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