Question

Describe and correct the error : |-13| - |13| = -13 - 13 = 26

Answer 1

First, 
|-13| represents the absolute value of the number 13. Absolute values cannot be negative. So |-13| cannot become -13, it would become 13. 


So, 
|-13| - |13| = -13 - 13 = 26 would become
|-13| - |13| = 13 - 13 = 0