Q. 1 K4.0( 2 Votes )

Verify Lagrange’s

Answer :

Lagrange’s mean value theorem states that if a function f(x) is continuous on a closed interval [a, b] and differentiable on the open interval (a, b), then there is at least one point x=c on this interval, such that


This theorem is also known as First Mean Value Theorem.

f(x) is continuous in [1, 3]

Differentiating with respect to x:


f’(x) exists for all values except 0

f(x) is differentiable in (1, 3)

So both the necessary conditions of Lagrange’s mean value theorem is satisfied.

On differentiating with respect to x:

For f’(c), put the value of x=c in f’(x):

For f(3), put the value of x=3 in f(x):

For f(1), put the value of x=1 in f(x):

f(1) = 2

6(c2 – 1) = 4c2

6c2 – 6 = 4c2

6c2 – 4c2 = 6

2c2 = 6

c2 = 3

Hence, Lagrange’s mean value theorem is verified.

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