\[y = 0,5x^{2}\]
\[y < 2\]
\[0,5x^{2} < 2\]
\[0,5x² - 2 < 0\ \ \ | \cdot 2\]
\[x^{2} - 4 < 0\]
\[(x - 2)(x + 2) < 0\]