(adsbygoogle = window.adsbygoogle || []).push({}); The problem statement, all variables and given/known data

Explain graph of y=√x

The attempt at a solution

I've done the graph on an online graphing calculator:

http://s2.ipicture.ru/uploads/20120117/7JtQ5VD2.png

But i don't understand why there is no equivalent reflection below the x-axis, in the 4th quadrant.

From y=√x,

if x=4, then y is either 2 or -2. Correct? Then, why is the value -2 discarded?

Furthermore, if i rewrite the equation y=√x as x=y^2, then the graph does indeed become like this:

http://s2.ipicture.ru/uploads/20120117/p9hbKFr6.gif

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# Homework Help: Explain graph of y=√x

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