
Β
Introducing your new favourite teacher - Teachoo Black, at only βΉ83 per month
Find intervals of increasing/decreasing
Find intervals of increasing/decreasing
Last updated at Aug. 19, 2021 by Teachoo
Ex 6.2, 6 Find the intervals in which the following functions are strictly increasing or decreasing: (a) π₯2 + 2π₯ β 5 f(π₯) = π₯2 + 2π₯ β 5 Calculating fβ (π) fβ(π₯) = 2π₯ + 2 fβ(π₯) = 2 (π₯ + 1) Putting fβ (π) = 0 2 (π₯ + 1) = 0 (π₯ + 1) = 0 π = β1 Plotting point on real line Hence, f is strictly decreasing for (ββ ," β1" ) f is strictly increasing for ( "β1" ,β)