If f(2) = 5 and f '(x) ≥ 1 for 2 ≤ x ≤ 6, how small can f(6) possibly be?
If f is continuous on [a,b] and differentiable on (a,b) then according to mean value theorem there exists c in (a,b) such that,
Let's assume that f is continuous on [2,6] and differentiable on (2,6) then according to mean value theorem there exists c in (2,6) such that,
Hence we can say that,
we have f(2) = 5 hence,
The smallest value of f(6) possibly be 9
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