=>[tex](x+1).\sqrt{17-x^{2}}-8+x-1=0[/tex]
=>[tex]\frac{-x^{4}-2x^{3}+16x^{2}+34x+17-64}{(x+1).\sqrt{17-x^{2}}+8}+x-1=0[/tex]
=>[tex]\frac{(x-1).(-x^{3}-3x^{2}+13x+47)}{(x+1)\sqrt{17-x^{2}}+8}+(x-1)=0[/tex]
=>[tex](x-1).(\frac{-x^{3}-3x^{2}+13x+47}{(x+1).\sqrt{17-x^{2}}+8}+1)=0[/tex]