Answer :
[tex]8-11\sqrt\frac{25}{121}=8-11\times\frac{\sqrt{25}}{\sqrt{121}}=8-11\times\frac{5}{11}=8-5=3[/tex]
[tex]8-11^{\sqrt{\frac{25}{121}}}=8-11^{\frac{5}{11}}=5.025867[/tex]