A) \[-2xy-2yz-2zx\]
B) \[-3xy-yz-zx\]
C) \[-3xy-3yz-3zx\]
D) \[-3xy-yz\]
Correct Answer: A
Solution :
Let added number be p. \[\Rightarrow \]\[(xy+yz+zx)+p=-xy-yz-zx\] \[\Rightarrow \]\[p=-xy-yz-zx-(xy+yz+zx)\] \[=xy-yz-zx-xy-yz-zx\] \[=-2xy-2yz-2zx\]
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