[tex]\displaystyle\bf\\x^{2}-10x+c=0\\\\x_{1} =3\\\\Teorema \ Vieta:\\\\1) \ x_{1} +x_{2} =10\\\\3+x_{2} =10\\\\x_{2} =10-3=7\\\\2) \ x_{1} \cdot x_{2} =c\\\\c=3\cdot 7=21\\\\\\Otvet: \ x_{2} =7 \ \ ; \ \ c=21[/tex]
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[tex]\displaystyle\bf\\x^{2}-10x+c=0\\\\x_{1} =3\\\\Teorema \ Vieta:\\\\1) \ x_{1} +x_{2} =10\\\\3+x_{2} =10\\\\x_{2} =10-3=7\\\\2) \ x_{1} \cdot x_{2} =c\\\\c=3\cdot 7=21\\\\\\Otvet: \ x_{2} =7 \ \ ; \ \ c=21[/tex]