A) 42, 3; - 42, 3
B) -42, -3; 42, -3
C) 42, 3; - 42, - 3
D) 42, 3; 42, 3
Correct Answer: B
Solution :
Minor of - 4 = \[\left| \begin{matrix} -2 & 3 \\ 8 & 9 \\ \end{matrix}\, \right|=-42\], 9 = \[\left| \begin{matrix} -1 & -2 \\ -4 & -5 \\ \end{matrix} \right|=-3\]and cofactor of - 4 =\[{{(-1)}^{2+1}}(-42)=42\],cofactor of 9= \[{{(-1)}^{3+3}}(-3)=-3\] .
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