a . \(3\sqrt{2x}-\dfrac{1}{3}\sqrt{18x}=\sqrt{24}\) ( ĐK : \(x\ge0\) )
\(\Leftrightarrow3\sqrt{2x}-\sqrt{2x}=\sqrt{24}\)
\(\Leftrightarrow2\sqrt{2x}=\sqrt{24}\)
\(\Leftrightarrow\sqrt{2x}=\sqrt{6}\)
\(\Leftrightarrow2x=6\)
\(\Leftrightarrow x=3\)
làm mốt câu còn lại nha .
b) ta có : \(\sqrt{x^2+10\left|x\right|+25}=2\left|x\right|+1\Leftrightarrow\sqrt{\left(\left|x\right|+5\right)^2}=2\left|x\right|+1\)
\(\Leftrightarrow\left|x\right|+5=2\left|x\right|+1\Leftrightarrow\left|x\right|=4\Leftrightarrow x=\pm4\)
vậy \(x=\pm4\)