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Increasing and Decreasing Functions

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Estimated time: 5 minutes
Maharashtra State Board: Class 12

Definition: Increasing Function

A function ( f(x) ) is said to be an increasing function on ((a, b)) if x₁ < x₂ ⇒ f(x₁) ≤ f(x₂)

Strictly Increasing Function:

  • If x₁ < x₂ ⇒ f(x₁) < f(x₂)
Maharashtra State Board: Class 12

Definition: Decreasing Function

A function ( f(x) ) is said to be a decreasing function on (a, b) if x₁ < x₂ ⇒ f(x₁) ≥ f(x₂)

Strictly Decreasing Function:

  • If x₁ < x₂ ⇒ f(x₁) > f(x₂)
Maharashtra State Board: Class 12

Definition: Monotonic Function

A function ( f ) is said to be monotonic in an interval if it is either increasing or decreasing in that interval.

Maharashtra State Board: Class 12

Key Points: First Derivative Test for Increasing and Decreasing Function

  • f′(x) > 0 ⇒ function increasing
  • f′(x) < 0 ⇒ function decreasing
  • f′(x) = 0 ⇒ function constant

Video Tutorials

We have provided more than 1 series of video tutorials for some topics to help you get a better understanding of the topic.

Series 1


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Shaalaa.com | Increasing Decreasing Functions Introduction Part 1

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Increasing Decreasing Functions Introduction Part 1 [00:37:26]
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