Wavy curve method

 Basic Inequalities 

If a>b then

a+c>b+c

a-c>b-c

ac>bc if c is positive 

ac<bc if c is negative 

There are 5 inequality symbols,

These inequality symbols are: less than (<), greater than (>), less than or equal (≤), greater than or equal (≥) and the not equal symbol (≠).

Intervals in Mathematics 

In mathematics real interval is a set of real number that contains all real number lying between any two numbers of the set.

Intervals notation 

 Suppose 1 ≤ x < 3, then we represent it by x∈ (belongs to symbol is ∈)  [1,3) 

So you can conclude that the symbol [ / ] means the point is included and

"( "/ ") " this symbol means the point is not included. 

Wavy curve method 

Please click on the above given link, we are preparing the post on wavy curve method,  hopefully within 2 days it will be ready but if you are not aware of the theory please refer to the above given link.