Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class

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Last updated at June 12, 2023 by Teachoo

Example 10 Find the intervals in which the function f given by f (x) = x2 â 4x + 6 is (a) strictly increasing (b) strictly decreasingf (đĽ) = đĽ2 â 4đĽ + 6 Calculate fâ(đ) đâ (đĽ) = 2đĽ â 4 Calculate fâ(đ) = 0 2đĽ â 4 = 0 2đĽ = 4 đĽ = 4/2=2 Hence đĽ = 2 divide real line into 2 disjoint intervals. Plotting points on number line