Mathematics

Chloe Thornton

11 September, 11:42

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

2 < - 3x - 4 < 5

6 < - 3x < 5

-2 > x > - 5/3

a. The student should have added 4 to all parts (left, middle, and right) to get 6 < - 3x < 9.

b. The student divided 6/-3 incorrectly.

c. The student should not have switched the direction of the sign in the final step.