Question

Let f : R → R be a differentiable function such that f (a) = 0 = f (b) and f ′(a) f ′(b) > 0 for some a < b. Then the minimum number of roots of f ′(x = 0 in the interval (a, b) is-

(A) 3

(B) 2

(C) 1

(D) 0

Answer 1

Correct Option :- (B)

Explanation :-