Salut.
11.
a)
[tex]=-2\sqrt{2} \\x^{2} =(-2\sqrt{2})^{2} =4*2=8[/tex]
d)
[tex]=5*2\sqrt{6} -2*3\sqrt{6} =10\sqrt{6} -6\sqrt{6} =4\sqrt{6} \\\\x^{2} =(4\sqrt{6})^{2} =16*6=96[/tex]
12.
a)
[tex]=3\sqrt{2} \\\\x^{3} =(3\sqrt{2})^{3}=27*2\sqrt{2} =54\sqrt{2}[/tex]
d)
[tex]=10\sqrt{3} -20\sqrt{3} =-10\sqrt{3} \\\\(-10\sqrt{3})^{3} =3000\sqrt{3}[/tex]
13.
[tex]=2\sqrt{3} \\\\(2\sqrt{3})^{2} =4*3=12[/tex]
d)
[tex]=3\sqrt{6} -2\sqrt{6} -5\sqrt{6} =-4\sqrt{6} \\\\x^{2} =(-4\sqrt{6})^{2}=16*6=96[/tex]
