Chapter 4 - An Introduction to Functions - 4-4 Graphing a Function Rule - Mixed Review - Page 259: 54

z=-2 or z=4

First , we could both sides of the equation by 8 , and get the equation /z-1/=3 Based on the property of both negative and positive input value could get positive absolute output value , we could get two conditions of the equations z-1=3 or z-1=-3 and we add both sides of the equation 1 and can get the final answer z=4 or z=-2