There are a couple of ways to think of taking the absolute
value of a number. The different ways of thinking about it helps
sometimes when proving. The first way of thinking of absolute value
involves squaring and taking the square root.
Let's try working a problem with an absolute value.
Consider the general inequality:
There is a special inequality that has a name. It comes up
in linear algebra as well. It is called the triangle inequality:
Let's try solving a more specific inequality with an absolute value: