[tex]\displaystyle\bf\\x^{2} +12x-13=0\\\\Teorema \ Vieta \ :\\\\x_{1} + x_{2} =-12\\\\x_{1} \cdot x_{2} =-13\\\\\\2x_{1} \cdot x_{2} -x_{1} - x_{2} =2x_{1} \cdot x_{2} -(x_{1} +x_{2} )=\\\\=2\cdot(-13)-(-12)=-26+12=-14\\\\\\Otvet \ : \ -14[/tex]
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[tex]\displaystyle\bf\\x^{2} +12x-13=0\\\\Teorema \ Vieta \ :\\\\x_{1} + x_{2} =-12\\\\x_{1} \cdot x_{2} =-13\\\\\\2x_{1} \cdot x_{2} -x_{1} - x_{2} =2x_{1} \cdot x_{2} -(x_{1} +x_{2} )=\\\\=2\cdot(-13)-(-12)=-26+12=-14\\\\\\Otvet \ : \ -14[/tex]