You can
put this solution on YOUR website! .
You can use either of inequalities
2 - 0.0004 <= p <= 2 + 0.0004, which is the same as
1.9996 <= p <= 2.0004
or
|2 - p | <= 0.0004.
The plot below shows the number line and the range for p on the number line
----|=======|=======|=======|=======|=======|========|=======|=======|------
1.9996 1.9997 1.9998 1.9999 2 2.0001 2.0002 2.0003 2.0004
=============
Keep in mind that the plot in the post by @ewatrrr is INCORRECT.
@ewatrr, may I ask you please to CLOSE the operators < font > and < b >
EVERY TIME at the end of your posts ?