Do 2 vế đều ko âm, BPT tương đương:
\(\left(x^2+2x+2\right)^2>\left(2x-7\right)^2\)
\(\Leftrightarrow\left(x^2+2x+2\right)^2-\left(2x-7\right)^2>0\)
\(\Leftrightarrow\left(x^2+9\right)\left(x^2+4x-5\right)>0\)
\(\Leftrightarrow x^2+4x-5>0\)
\(\Leftrightarrow\left[{}\begin{matrix}x< -5\\x>1\end{matrix}\right.\)