Let f be differentiable for all x. If f(1)=−2 and f′(x)≥2 for all xϵ[1,6] then
A
f(6)<8
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B
f(6)≥8
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C
f(6)≥5
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D
f(6)≤5
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Solution
The correct option is Cf(6)≥8 Given that f(1)=−2 and f′(x)≥2∀x∈[1,6]
Lagrange's mean value theorem states that if f(x) be continuous on [a,b] and differentiable on (a,b) then there exists some c between a and b such that f′(c)=f(b)−f(a)b−a
Given that f is differentiable for all x. Therefore, lagrange's mean value theorem can be applied.