Let's take [itex]y=x^2[/itex] as an example. This function decreases if [itex]-\infty < x < 0[/itex] and increases if [itex]0 > x > \infty[/itex]. But what about [itex]x=0[/itex]? Shouldn't it be included in one of the two ranges of [itex]x[/itex]?(adsbygoogle = window.adsbygoogle || []).push({});

- Kamataat

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# Increasing/decreasing f(x)

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