If the x is also supposed to be included in the radical, then you should be [tex] \sqrt{18} [/tex] which simplifies to [tex] 3\sqrt{2} [/tex] or approximately 4.24
If the x is on the outside, [tex] \sqrt{24} [/tex] simplifies to [tex] 2\sqrt{6} [/tex]. Now do [tex]2 \sqrt{6} - 6[/tex] in a calculator to get approximately - 1.10
