** a>0** means ** a ** always positive number, for example +5

**b<0** means **b ** always negative number ( it has negative sign), for example -8

** b-a** = 5 - (-8) = 13 that's mean your answer will be **always positive**

** ** so when you take the absolute value for positive number it will make no difference,

Therefore ** ****| a - b | = a - b.**