# Ex 6.2, 6 (d) - Chapter 6 Class 12 Application of Derivatives (Term 1)

Last updated at Aug. 19, 2021 by Teachoo

Ex 6.2

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Ex 6.2, 6 (a)

Ex 6.2, 6 (b) Important

Ex 6.2, 6 (c) Important

Ex 6.2, 6 (d) You are here

Ex 6.2, 6 (e) Important

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Ex 6.2, 12 (A)

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Ex 6.2, 12 (C) Important

Ex 6.2, 12 (D)

Ex 6.2, 13 (MCQ) Important

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Ex 6.2,19 (MCQ) Important

Last updated at Aug. 19, 2021 by Teachoo

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Ex 6.2, 6 Find the intervals in which the following functions are strictly increasing or decreasing: (d) 6 â 9đĽ â đĽ2 đ(đĽ) = 6 â 9đĽ â đĽ2 Calculating fâ(đ) fâ(đĽ) = â9 â 2đĽ fâ(đĽ) = â(2đĽ+9) Putting fâ(đ) = 0 â(2đĽ+9) = 0 2đĽ + 9 = 0 2đĽ = â 9 đ = (âđ)/đ Plotting point đ = (âđ)/đ on real line Hence f is strictly Increasing for đ < (âđ)/đ & strictly Decreasing for đ > (âđ)/đ