differentiation

Question: For the function $f(x) = {x^2} - 6x + 8,2 \le x \le 4$, the value of x for which $f'(x)$ vanishes, is



1) $\frac{9}{4}$
2) $\frac{5}{2}$
3) 3
4) $\frac{7}{2}$
Solution: Explanation: Explanation
standard-differentiation

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