a) ĐKXĐ: \(x\ge-5\)
\(pt\Leftrightarrow2\sqrt{x+5}-3\sqrt{x+5}+4\sqrt{x+5}=6\)
\(\Leftrightarrow3\sqrt{x+5}=6\Leftrightarrow\sqrt{x+5}=2\)
\(\Leftrightarrow x+5=4\Leftrightarrow x=-1\left(tm\right)\)
b) \(VT=\left[\dfrac{\sqrt{x}\left(\sqrt{x}-1\right)}{\sqrt{x}-1}-2\right]\left[\dfrac{\sqrt{x}\left(\sqrt{x}+1\right)}{\sqrt{x}+1}+2\right]\)
\(=\left(\sqrt{x}-2\right)\left(\sqrt{x}+2\right)=x-4=VP\)

