[Calculating Total Reactance]

do you add it or find the difference ( subtract) ?

X= XL+Xc or is it this X = XL- Xc  or this X= Xc-XL

"Pure reactances
Pure inductive reactances (XL) and capacitive reactances (XC) simply add together
when coils and capacitors are in series. Thus, X =XL+XC. In the RX plane, their vectors
add, but because these vectors point in exactly opposite directions