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f(x) = x2 + 5x + 6

At a critical point, f'(x) = 0.

f'(x) = 2x + 5 = 0

2x = -5

x = -2.5

f(-2.5) = (-2.5)2 + 5(-2.5) + 6 = (6.25) - (7.5) + (6) = 4.75

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15y ago

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