Suppose I have any modular function, for example:(adsbygoogle = window.adsbygoogle || []).push({});

[tex]f(x) = |2x + 4| + 3[/tex]

I can rewrite the function in the following way:

[tex]f(x) = \left\{\begin{matrix}

2x + 7, \;\; x \geq -2\\

-2x -1, \;\; x < -2

\end{matrix}\right.[/tex]

right?

Okay, the question is: how do I know that the first condition is [tex]\geq[/tex] and second condition is < and not vice-versa?

Thank you,

Rafael Andreatta

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# Question about modular functions

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