Find the student’s error in solving the following inequality. 2 < –3x –4 < 5 6 < –3x < 5 –2 > x > –5/3

asked Apr 4, 2016 157k views

4 votes

Find the student’s error in solving the following inequality.

2 < –3x –4 < 5
6 < –3x < 5
–2 > x > –5/3

8.9k points

Please log in or register to add a comment.

5 votes

The student didn't add 4 to all expressions in the inequality.
It should be:

$2<-3x-4<5 \ \ \ |+4 \\ 6<-3x<9 \ \ \ |/ (-3) \\ -2>x>-3$

Sevin answered Apr 9, 2016

by Sevin

7.9k points

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.5m questions

12.2m answers