# Chapter 5 - Graphs and the Derivative - 5.1 Increasing and Decreasing Functions - 5.1 Exercises - Page 260: 6

a) $(1;5)$ b) $(-\infty;1)$ & $(5;\infty)$

#### Work Step by Step

Step 1: Find critical points where $h'(x)=0$ Step 2: If $h'(x)$ is positive, the function is increasing Step 3: If $h'(x)$ is negative, the function is decreasing

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