A) - 45
B) 44
C) 54
D) - 54
Correct Answer: A
Solution :
The lines are concurrent, if \[\left| \,\begin{matrix} 7 & -8 & 5 \\ 3 & -4 & 5 \\ 4 & 5 & k \\ \end{matrix}\, \right|=0\] Þ\[7(-4k-25)+8(3k-20)+5(15+16)=0\Rightarrow k=-45\].You need to login to perform this action.
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