a: \(x-4=\left(\sqrt{x}-2\right)\left(\sqrt{x}+2\right)\)
b: \(x-4\sqrt{x}+4=\left(\sqrt{x}-2\right)^2\)
c: \(x+6\sqrt{x}+9=\left(\sqrt{x}+3\right)^2\)
d: \(x-10\sqrt{x}+25=\left(\sqrt{x}-5\right)^2\)
e: \(x-\sqrt{x}=\sqrt{x}\left(\sqrt{x}-1\right)\)
g: \(x-2\sqrt{x}=\sqrt{x}\left(\sqrt{x}-2\right)\)
h: \(3x-\sqrt{x}=\sqrt{x}\left(3\sqrt{x}-1\right)\)