[tex]\displaystyle\bf\\2x^{2} +16x+c=0\\\\x_{1} =3\\\\2\cdot 3^{2}+16\cdot 3+c=0\\\\18+48+c=0\\\\66+c=0\\\\c=-66\\\\\\2x^{2} +16x-66=0 \ |: 2\\\\x^{2} +8x-33=0\\\\Teorema \ Vieta \ :\\\\x_{1} + x_{2} =-8\\\\x_{2} =-8-x_{1} =-8-3=-11\\\\x_{2}=-11\\\\\\Otvet \ : \ c=-66 \ \ ; \ \ x_{2} =-11[/tex]
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[tex]\displaystyle\bf\\2x^{2} +16x+c=0\\\\x_{1} =3\\\\2\cdot 3^{2}+16\cdot 3+c=0\\\\18+48+c=0\\\\66+c=0\\\\c=-66\\\\\\2x^{2} +16x-66=0 \ |: 2\\\\x^{2} +8x-33=0\\\\Teorema \ Vieta \ :\\\\x_{1} + x_{2} =-8\\\\x_{2} =-8-x_{1} =-8-3=-11\\\\x_{2}=-11\\\\\\Otvet \ : \ c=-66 \ \ ; \ \ x_{2} =-11[/tex]