Question

What is (-∞, -3) U (-3, ∞) in inequality notation?

Answer 1

`x < -3` AND `x > -3`
or
`-3 < x < -3`

Explanation:

Since we know that parentheses (soft brackets) next to a number means that it is NOT including that number, we know that `-3` is not a solution.

It can be anything less than or greater than `-3`, but not `-3`, so the inequality can be written as:
`x < -3` AND `x > -3`
or
`-3 < x < -3`

Hope this helps!