Question

How do I Express the inequality x < 7 using interval notation.

Answer 1

Answer:  $(-\infty, 7)$

You can write this as (-infinity, 7) if you aren't able to use the infinity symbol.

====================================================

Explanation:

Think of x < 7 as writing $-\infty < x < 7$

So x is between negative infinity and 7, excluding both endpoints.

To write $-\infty < x < 7$ in interval notation, we write $(-\infty, 7)$

The curved parenthesis tell us to exclude the endpoint.