CK-12-Pre-Calculus Concepts

1.7. Increasing and Decreasing http://www.ck12.org

1.7 Increasing and Decreasing

Here you will apply interval notation to identify when functions are increasing and decreasing.
It is important to be able to distinguish between when functions are increasing and when they are decreasing. In
business this could mean the difference between making money and losing money. In physics it could mean the
difference between speeding up and slowing down.
How do you decide when a function is increasing or decreasing?

Watch This

MEDIA

Click image to the left for use the URL below.

URL: http://www.ck12.org/flx/render/embeddedobject/57943

http://www.youtube.com/watch?v=78b4HOMVcKM James Sousa: Determine Where a Function is Increasing or
Decreasing

Guidance

Increasingmeans places on the graph where the slope is positive.

The formal definition of an increasing interval is: an open interval on thexaxis of(a,d)where everyb,c∈(a,d)
withb<chasf(b)≤f(c).