![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
The expression is ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=a502a6a647e35541ae97e4fb3d9992ef.png\")
. Radicand is 144.
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=eef158ee8d3d61b4987ea3cea673047c.png\")
. (The negative square root of radicand: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=b5c622b68fc485b428977392b951b973.png\")
)
§ Observe the Venn diagram:
\§ The number ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=59507620d6c4caa7925cefadcc2e8d5d.png\")
is a positive integer number (Z).
§ The sets of integers (Z) are subsets of rational number (Q).
\§ All rational numbers (Q) are real numbers (R). ![\"\"](\"/userfiles/image/realnumber.jpg\")
![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
The number ![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=a502a6a647e35541ae97e4fb3d9992ef.png\")
belongs to Z, Q and R.