[tex]\displaystyle\bf\\2x^{2} +7x+c=0\\\\x_{1} =-3\\\\2\cdot(-3)^{2} +7\cdot(-3)+c=0\\\\2\cdot 9-21+c=0\\\\18-21+c=0\\\\-3+c=0\\\\\boxed{c=3}\\\\2x^{2} +7x+3=0\\\\D=7^{2}-4\cdot 2\cdot 3=49-24=25=5^{2}\\\\\\x_{2}=\frac{-7+5}{4}=-\frac{2}{4} =-0,5\\\\\\\boxed{x_{2} =-0,5}\\\\\\Otvet \ : \ x=-0,5 \ \ ; \ \ c=3[/tex]
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[tex]\displaystyle\bf\\2x^{2} +7x+c=0\\\\x_{1} =-3\\\\2\cdot(-3)^{2} +7\cdot(-3)+c=0\\\\2\cdot 9-21+c=0\\\\18-21+c=0\\\\-3+c=0\\\\\boxed{c=3}\\\\2x^{2} +7x+3=0\\\\D=7^{2}-4\cdot 2\cdot 3=49-24=25=5^{2}\\\\\\x_{2}=\frac{-7+5}{4}=-\frac{2}{4} =-0,5\\\\\\\boxed{x_{2} =-0,5}\\\\\\Otvet \ : \ x=-0,5 \ \ ; \ \ c=3[/tex]