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What is the condition for a function f to be increasing 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)The question was posed to me during an online exam.The query is from Derivatives Application in chapter Application of Derivatives of Mathematics – Class 12

Answer»

The correct answer is (d) F’(x) ≥ 0 ∀ X1, X2 ∈ (a,b)

For explanation: 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 increasing on (a,b).



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