\(x\left(1-5\sqrt{x+3}\right)=3\left(x^2-4\right)\)
\(ĐKXĐ:x\ge-3\)
\(x\left(10-5\sqrt{x+3}\right)=3\left(x^2+3x+4\right)\)
\(\Leftrightarrow x.\frac{25-25x}{10+5\sqrt{x+3}}=3\left(x-1\right)\left(x+4\right)\)
\(\Leftrightarrow\left(x-1\right)\left[3\left(x+4\right)+\frac{25x}{10+5\sqrt{x+3}}\right]=0\)
\(\Leftrightarrow x-1=0\)
\(\Leftrightarrow x=1\)
Vậy...............