ĐKXĐ: \(x\in R\)
\(pt\Leftrightarrow\left\{{}\begin{matrix}x^2=\sqrt{3x^2+1}-1\\x\ge0\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x^2+1=\sqrt{3x^2+1}\\x\ge0\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x^4+2x^2+1=3x^2+1\\x\ge0\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x^4-x^2=0\\x\ge0\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x^2\left(x^2-1\right)=0\\x\ge0\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x=1\end{matrix}\right.\)