Question

√(x-4√x+4)+√(x-10√x+25)

Answer 1

$\tt\sqrt{x-4\sqrt{x}+4}+\sqrt{x-10\sqrt{x}+25}=\sqrt{(\sqrt{x}-2)^2}+\sqrt{(\sqrt{x}-5)^2}=\\\\=|\sqrt{x}-2|+|\sqrt{x}-5|$