How to write (-4,3]U[2,7) as a single interval

Question

How do you write (-4,3]U[2,7) as a single interval?

Answer 1

(-4, 7]

 

is the correct answer since in the original question, the -4 has a parenthesis mark instead of a left bracket.

 

 

Answer 2

The intervals overlap, so it includes all numbers from -4 to +7.  So it can be written as:

 

(-4,7]