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What is the condition for a function f to be decreasing if f be continuous and differentiable on (a,b)?(a) f’(x) > 0 ∀ x1, x2 ∈ (a,b)(b) f’(x) < 0 ∀ x1, x2 ∈ (a,b)(c) f’(x) = 0 ∀ x1, x2 ∈ (a,b)(d) f’(x) ≤ 0 ∀ x1, x2 ∈ (a,b)I got this question in my homework.The doubt is from Derivatives Application topic in portion Application of Derivatives of Mathematics – Class 12

Answer»

Right CHOICE is (d) f’(x) ≤ 0 ∀ x1, X2 ∈ (a,b)

To EXPLAIN: If a function f be continuous and differentiable on (a,b), then f’(x) ≤ 0 ∀ x1, x2 ∈ (a,b) is the CONDITION for the function f(x) to be decreasing on (a,b).



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