How do you graph $f (x) = \sqrt{x - 8}$ $f(x)=sqrt(x-8)$ ?

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Answer 1 · 2016-04-12T17:12:51

enter image source here
This function is not defined in the red area.

The given function describes a curve as shown in the graph.

Why is the function not defined in the coloured area?

The answer to this question is given in the image below:

enter image source here

How do you graph f(x)=sqrt(x-8)f(x)=√x−8f(x)=sqrt(x-8)?