How to graph square root function

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How to graph the this square root function $$f(x) = \sqrt {x^2-8x+16}$$

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Factorize $x^{2}-8x+16$ gets $(x-4)^{2}$, so the function becomes $|x-4|$. If you know how to draw $y=|x|$, then $y=|x-4|$ is just the right shift to $4$ unit.