2010011505
Level:
B
Assuming \(x\in \mathbb{R}\),
find the solution set of the following inequality.
\[
(x+3)^2-1+3x^2 >(2-2x)^2
\]
\(\left( -\frac27,\infty\right)\)
\(\left( \frac27,\infty\right)\)
\(\left( -\infty,\frac27 \right)\)
\(\left( -\infty,-\frac27\right)\)
