A) \[3{{x}^{2}}-10x+21=0\]
B) \[3{{x}^{2}}-10x+7=0\]
C) \[3{{x}^{2}}+10x+7=0\]
D) \[3{{x}^{2}}+10x-13=0\]
Correct Answer: B
Solution :
\[\left| 3+4-12\lambda +13 \right|=\left| -9+0-12+13 \right|\] \[\left| -12\lambda +20 \right|=\left| 8 \right|\] \[\left| 3\lambda -5 \right|=2\] \[9{{\lambda }^{2}}+25-30\lambda =4\] \[9{{\lambda }^{2}}-30\lambda +21=0\] \[3{{\lambda }^{2}}-10\lambda +7=0\]
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