Question

What is the solution set of {x | x > -5} U {x | x < 5}?

a. all numbers except -5 and 5
b. the numbers between -5 and 5
c. the empty set
d. all real numbers

It would be all numbers less than 5 and all numbers greater than -5. So it would be all numbers except -5 and 5, right?

Answer 1

x > -5 and x < 5

can also be written as : -5 < x < 5
all numbers between -5 and 5