ĐKXĐ: ...
\(\Leftrightarrow3x^2-4x-15+\sqrt{x+1}-2=0\)
\(\Leftrightarrow\left(3x+5\right)\left(x-3\right)+\frac{x-3}{\sqrt{x+1}+2}=0\)
\(\Leftrightarrow\left(x-3\right)\left(3x+5+\frac{1}{\sqrt{x+1}+2}\right)=0\)
\(\Leftrightarrow x=3\) (ngoặc to luôn dương với mọi \(x\ge-1\))