Problem #WSP-100022

Problems Algebra Algebraic inequalities and systems of inequalities

Problem

We can define the absolute value $| x |$ of any real number $x$ as follows. $| x | = x$ if $x \geq 0$ and $| x | = - x$ if $x < 0$ . What are $| 3 |$ , $| - 4.3 |$ and $| 0 |$ ?

Prove that $| x | \geq 0$ .

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