From the given data, the maximum value of y is given as

x

-1

1

2

3

y

-21

15

12

3

1
At x = 1.1743, ymax = 15.171612
2
At x = 0.1743, ymax = 15.171612
3
At x = -1.1743, ymax = 15.171612
4
At x = 2.1743, ymax = 15.171612

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