dkxd: x≥ -1
\(\sqrt{x+1}+\sqrt{x+6}=5\)
\(\Leftrightarrow\sqrt{\left(x+1\right)}^2=\left(5-\sqrt{x+6}\right)^2\)
\(\Leftrightarrow x+1=x+6-10\sqrt{x+6}+25\)
\(\Leftrightarrow10\sqrt{x+6}=30\)
\(\Leftrightarrow\sqrt{x+6}=3\)
\(\Leftrightarrow x+6=9\Leftrightarrow x=3\left(TM\right)\)
Vay pt co 1 nghiem x = 3