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1)

A value of c for which conclusion of Mean Value Theorem holds for the function f (x) = logex on the interval [1, 3] is


A) log3e

B) loge3

C) 2log3e

D) 12log3e

Answer:

Option C

Explanation:

Using Lagrange's Mean Value Theorem Let f(x) be a function defined on [a, b]

then f'(c) = f(b)f(a)ba   ...(1)

cϵ[a,b]

Givenf(x)=logex                         f(x)=1x

equation (1) become

1c=f(3)f(1)31

1c=loge3loge12 = loge32

c = 2log3e