If the two equations \[{{x}^{2}}-cx+d=0\] and \[{{x}^{2}}-ax+b=0\] have one common root and the second has equal roots, then \[2(b+d)=\]

If the two equations \[{{x}^{2}}-cx+d=0\] and \[{{x}^{2}}-ax+b=0\] h

1.	If the two equations \[{{x}^{2}}-cx+d=0\] and \[{{x}^{2}}-ax+b=0\] have one common root and the second has equal roots, then \[2(b+d)=\]
A.	0
B.	\[a+c\]
C.	\[ac\]
D.	\[-ac\]
Answer» D. \[-ac\]

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If the two equations \[{{x}^{2}}-cx+d=0\] and \[{{x}^{2}}-ax+b=0\] have one common root and the second has equal roots, then \[2(b+d)=\]

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