\(ax^2 + 6x + 3 = 0|:a\)
\(x^2 + \frac{6}{a}x = -\frac{3}{a}\)
\((x + \frac{3}{a})^2 = -\frac{3}{a}+ (\frac{3}{a})^2=\frac{9}{a^2} -\frac{3a}{a^2}=\frac{9-3a}{a^2}|\sqrt{}\)
\(x + \frac{3}{a} = -\frac{3}{a}+ (\frac{3}{a})^2=\frac{9}{a^2} -\frac{3a}{a^2}=+-\sqrt{\frac{9-3a}{a^2}}\)
\(+-\frac{1}{a}*\sqrt{9-3a}>0\)
\(+-\sqrt{9-3a}>0|^{2}\)
\(9-3a>0\)
\(9>3a\)
\(3>a\)
\(a<3\)
