[tex]\displaystyle\bf\\-3x^{2} +5x+9=0 \ |\cdot(-1)\\\\3x^{2} -5x-9=0\\\\D=(-5)^{2} -4\cdot 3\cdot(-9)=25+108=133\\\\\\x_{1} =\frac{5-\sqrt{133} }{6} \\\\\\x_{2} =\frac{5+\sqrt{133} }{6}[/tex]
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[tex]\displaystyle\bf\\-3x^{2} +5x+9=0 \ |\cdot(-1)\\\\3x^{2} -5x-9=0\\\\D=(-5)^{2} -4\cdot 3\cdot(-9)=25+108=133\\\\\\x_{1} =\frac{5-\sqrt{133} }{6} \\\\\\x_{2} =\frac{5+\sqrt{133} }{6}[/tex]