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[" 4.If "f(x)=x^(2)-6x+8,2<=x<=4" ,then ...

[" 4.If "f(x)=x^(2)-6x+8,2<=x<=4" ,then the value of x for which "f'(x)" vanishes is: "],[[" (A) "9-4," (B) "5-2," (C) "3," (D) "7/2]]

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