As noted above, capacitors and
inductors are basically functional opposites of each other. Therefore,
it should be no surprise that in some circuits their effects tend to
cancel each other. In other circuits their effects will tend to build
upon each other.
Inductors and capacitors in series.
If an inductor and capacitor are wired in series, the inductive
reactance and capacitive reactance will cancel each other. By
convention, to calculate total reactance you subtract capacitive
reactance from inductive reactance. This will give you a positive
number if more inductive reactance remains and a negative number if
more capacitive reactance remains.
X = (X_{L} X_{C} )
Where:

X 
=

Total reactance


X_{L} 
=

Inductive reactance in ohms


X_{C}

=

Capacitive reactance in ohms 
If you have a capacitive reactance of 75 ohms and an inductive
reactance of 50 ohms, the total reactance is 25 ohms of capacitive
reactance or 25 ohms.
50 – 75 = –25.
Since the result is a negative number, the circuit is capacitive.
We will get deeper into inductivecapacitive circuits a bit later. First let's review some math.