Verify Rolle’s theorem for each of the following functions:
Show that satisfies Rolle’s theorem on [0, 5] and that the value of c is (5/3)
Condition (1):
Since, f(x)=x(x-5)2 is a polynomial and we know every polynomial function is continuous for all xϵR.
⇒ f(x)= x(x-5)2 is continuous on [0,5].
Condition (2):
Here, f’(x)= (x-5)2+ 2x(x-5) which exist in [0,5].
So, f(x)= x(x-5)2 is differentiable on (0,5).
Condition (3):
Here, f(0)= 0(0-5)2=0
And f(5)= 5(5-5)2=0
i.e. f(0)=f(5)
Conditions of Rolle’s theorem are satisfied.
Hence, there exist at least one cϵ(0,5) such that f’(c)=0
i.e. (c-5)2+ 2c(c-5)=0
i.e.(c-5)(3c-5)=0
i.e. or c=5
Value of
Thus, Rolle’s theorem is satisfied.