[tex]\sqrt{5x+20}-\sqrt{x}=(x+1)^{2} \Rightarrow x^2+2x+1+\sqrt{x}-\sqrt{5x+20}=0 \Rightarrow x^2-1+\sqrt{x}-1+(2x+3)-\sqrt{5x+20}=0\Rightarrow (x-1)(x+1)+\frac{x-1}{\sqrt{x}+1}+\frac{4x^2+7x-11}{2x+3+\sqrt{5x+20}}=0\Rightarrow (x-1)(x+1+\frac{1}{\sqrt{x}+1}+\frac{4x+11}{2x+3+\sqrt{5x+20}})=0\Rightarrow x=1[/tex]