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What is the mathematical expression for monotonically decreasing function?(a) x1 < x2 ⇒ f(x1) ≤ f(x2) ∀ x1, x2 ∈ (a,b)(b) x1 < x2 ⇒ f(x1) ≥ f(x2) ∀ x1, x2 ∈ (a,b)(c) x1 = x2 ⇒ f(x1) ≤ f(x2) ∀ x1, x2 ∈ (a,b)(d) x1 < x2 ⇒ f(x1) = f(x2) ∀ x1, x2 ∈ (a,b)I got this question in semester exam.This interesting question is from Derivatives Application in division Application of Derivatives of Mathematics – Class 12

Answer»

The correct option is (b) x1 < x2 ⇒ F(x1) ≥ f(x2) ∀ x1, x2 ∈ (a,b)

Easy explanation: The DEFINITION of monotonically decreasing FUNCTION is if a function f : (a,b) → R is said to be monotonically decreasing on (a,b) if x1 < x2 ⇒ f(x1) ≥ f(x2) ∀ x1, x2 ∈ (a,b). Hence, the mathematical expression is x1< x2 ⇒ f(x1) ≥ f(x2) ∀ x1, x2 ∈ (a,b).



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