Answer
51 units
Work Step by Step
To find the absolute value of a given expression we need to define what is absolute value function. Absolute value of a number is its distance from the origin.
|x| = 0 if x = 0;
|x| = -x if x < 0;
|x| = x if x > 0;
a = 126, b =75
| a-b| = |126-75| = |51| = 51
