`\sqrt{3-2\sqrt{2}}`
`= \sqrt{2-2\sqrt{2}+1}`
`= \sqrt{(\sqrt{1})^2(\sqrt{2})^2-2\sqrt{2}+(\sqrt{1})^2}`
`= \sqrt{(1.\sqrt{2}-1)^2}`
`= 1 . \sqrt{2} - 1`
`= \sqrt{2} - 1`
`\sqrt{7-4\sqrt{3}}`
`=\sqrt{3-4\sqrt{3}+4}`
`=\sqrt{(\sqrt{1})^2(\sqrt{3})^2-4\sqrt{3}+(\sqrt{4})^2}`
`=\sqrt{(1.\sqrt{3}-2)^2}`
`=\sqrt{(2-1.\sqrt{3})^2}`
`= 2 - 1.\sqrt{3}`
`= 2 - \sqrt{3}`