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.Observe the graph, the domain of the function is non negative real numbers.
\The range of the function is also the non-negative real numbers.
\The function is increasing on the interval .
Therefore, it is a square root function.
\![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
Option ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=aa2616d3e0772f56b48846eab4e7d4bb.png\")
is correct.