Homework Help: Possible Values of the Inequality.

1. Sep 28, 2013

NATURE.M

1. The problem statement, all variables and given/known data

What are the possible values of |2x−3| when 0<|x−1|<2?

2. Relevant equations

3. The attempt at a solution

We know $\left|x-1\right|$ becomes x-1 if x-1≥0 and -(x-1) if x-1<0.
Now consider two cases.
Case 1:
0<x-1<2 $\Rightarrow$ 1<x<3 $\Rightarrow$ -1<2x-3<3.

Case 2:
0<-x+1<2 $\Rightarrow$ -1<x<1 $\Rightarrow$ -2<2x<2 $\Rightarrow$ -5<2x-3<-1.

Then the possible value include -1<|2x-3|<3 and -5<|2x-3|<-1.

2. Sep 28, 2013

Office_Shredder

Staff Emeritus
Saying -5< |2x-3| is not a particularly bold statement to make.... take another look at the inequalities you got before you took the absolute value and think a bit harder about what they tell you about the absolute value.

3. Sep 28, 2013

NATURE.M

Then the possible solutions should probably just be |2x-3|<3, since no solution exists to the inequality -5<|2x-3|<-1 since |2x-3| is bounded by negative values.
Am I right?