Hello, Eraser147!
When dealing with inequalities like this: .
The problem states that I need to write the given set as an interval or a union of two intervals.
Are both these answers correct?
. . . . . .
Obviously, both of them cannot be correct.
Here is helpful rule.
We have an inequality with an absolute value.
If the inequality is "less than",
. . then is between and .
This is written: .
If the inequality is "greater than",
. . then is "outside" of and .
This is written: .