A different form of Set Notation
For inequalities.
If it is >= then write ] If it is ⇐ then write [ If it is > then ( if it is < then )
Conversions
For the interval: 4 ⇐ x < 99 [ 4, 99)
its important to note that it must start with a open bracket/square bracket and end with a close bracket/square bracket This is not possible: (9, x (5 because that would mean that x is bigger than 9 and bigger than 5 which is redundant
Unions
For some inequalities you have 2 inequalities like
{-3 ⇐ x < 7} ,
{x >= 14}
so u have a number line that is split between 7 and 14.
to do this in Interval Notation, you will need to first convert the individual sets.
[-3, 7)
[14,inf)
then union the 2
[-3, 7) U [14,inf)
Numberline
[ Square brackets have CLOSED numberline dots. since it is = to the number inclusive
( Circle brackets have OPEN numberline dots
