Question

This inequality has a  symbol:

Answer 1

We know that
in the expression 3/(x+2) 
for x=-2-------> the denominator is zero

And the denominator cannot be zero, therefore the value of x = -2 can not belong to the domain of the function. That is the reason why the value of x = -2 cannot be included

Answer 2

1) Because the expression is undefined for x = –2, the value –2 must be excluded from the solution set.

2) Because –2 is not represented on the graph.