A) 9
B) 12
C) 15
D) 19
Correct Answer: D
Solution :
[d] Using Lagrange's mean value theorem, for some \[c\in (1,6)\] \[f'(c)=\frac{f(6)-f(1)}{5}=\frac{f(6)+2}{5}\ge 4.2\] Or \[f(6)+2\ge 21\] Or \[f(6)\ge 19\]You need to login to perform this action.
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