`(x-1)^2=4x-3+4\sqrt{x-1}` `ĐK: x >= 1`
`<=>(x-1)^2-4(x-1)-4\sqrt{x-1}-1=0`
`<=>(x-1)^2-(2\sqrt{x-1}+1)^2=0`
`<=>(x-1+2\sqrt{x-1}+1)(x-1-2\sqrt{x-1}-1)=0`
`<=>(\sqrt{x-1}+1)^2 (\sqrt{x-1}-1-\sqrt{2})(\sqrt{x-1}-1+\sqrt{2})=0`
`<=>[(\sqrt{x-1}=-1(VN)),(\sqrt{x-1}=1+\sqrt{2}),(\sqrt{x-1}=1-\sqrt{2}(VN)):}`
`<=>x-1=3+2\sqrt{2}`
`<=>x=4+2\sqrt{2}` (t/m)