[tex]\displaystyle\bf\\3x^{2} +mx-2=0\\\\x_{1} + x_{2} =5\\\\Teorema \ Vieta \ : \ \\\\x_{1} +x_{2} =-\frac{m}{3} \\\\-\frac{m}{3} =5\\\\-m=15\\\\\boxed{m=-15}[/tex]
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[tex]\displaystyle\bf\\3x^{2} +mx-2=0\\\\x_{1} + x_{2} =5\\\\Teorema \ Vieta \ : \ \\\\x_{1} +x_{2} =-\frac{m}{3} \\\\-\frac{m}{3} =5\\\\-m=15\\\\\boxed{m=-15}[/tex]