Correct Answer: Option D

Explanation

y = x\(^2\) - 6x + 8

\(\frac{dy}{dx}\) = 2x - 6

\(\frac{dy}{dx}\) = 0

2x - 6 = 0

x = 3

\(\therefore\) y = 3\(^2\) - 6(3) + 8

= 9 - 18 + 8

= -1

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