\(x^2+3\sqrt{x^2+3x}=10-3x\)
=>\(x^2+3x+3\sqrt{x^2+3x}-10=0\)
=>\(\left(\sqrt{x^2+3x}\right)^2+3\sqrt{x^2+3x}-10=0\)
=>\(\left(\sqrt{x^2+3x}+5\right)\left(\sqrt{x^2+3x}-2\right)=0\)
\(\Leftrightarrow\sqrt{x^2+3x}-2=0\)
=>\(\sqrt{x^2+3x}=2\)
=>x^2+3x=4
=>x^2+3x-4=0
=>(x+4)(x-1)=0
=>x=1 hoặc x=-4