What is the sign scheme method.Can you explain it briefly?

Sign scheme method : It helps us to determine the interval of an inequality.

Therefore, there are two sign scheme methods 

1) Quadratic inequality

2) Rational integrity inequality

Now, lets take an example: 

thus, the interval of inequality lies b/w -2 and 2 as follows:

Example 2) 

thus, the solution set consists of all real nos. which are less than -4 or all real nos. which are greater than 2 

it can be represented as follows:

 

example 3) 

it can be represented as follows:

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