a) \(x-8\sqrt{x}\)
\(=\sqrt{x}\left(\sqrt{x}-8\right)\)
b) \(x+3\sqrt{x}+2\)
\(=x+\sqrt{x}+2\sqrt{x}+2\)
\(=\sqrt{x}\left(\sqrt{x}+1\right)+2\left(\sqrt{x}+1\right)\)
\(=\left(\sqrt{x}+1\right)\left(\sqrt{x}+2\right)\)
c) \(x-16\)
\(=\left(\sqrt{x}\right)^2-4^2\)
\(=\left(\sqrt{x}+4\right)\left(\sqrt{x}-4\right)\)
d) \(8x\sqrt{x}-64\)
\(=\left(2\sqrt{x}\right)^3-4^3\)
\(=\left(2\sqrt{x}-4\right)\left(4x+8\sqrt{x}+16\right)\)
e: x+8căn x+16=(căn x+4)^2
f: =x(căn x+3)-7(căn x+3)
=(căn x+3)(x-7)
g: =2căn x(2căn x-1)
h: =x-2căn x-9căn x+18
=(căn x-2)(căn x-9)
i: =2x-4căn x+3căn x-6
=(căn x-2)(2căn x+3)
k: =(3căn x+4)^2