A) 0
B) 1
C) -1
D) -4
Correct Answer: C
Solution :
\[8a+4b+6c+2d=-\,4\] \[2a+6b+4c+8d=4\] On adding. \[10a+10b+10c+10d=0\] \[\Rightarrow \,\,a+\text{ }b+\text{ }c+\text{ }d=0\] \[\Rightarrow \,\,~a+d=-\left( b+c \right)\]You need to login to perform this action.
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