A) \[{{a}^{2}}+{{b}^{2}}+{{c}^{2}}-2ab+2bc-2ca\]
B) \[~{{a}^{2}}-{{b}^{2}}-{{c}^{2}}-2ab+2bc-2ca\]
C) \[{{x}^{2}}-{{y}^{2}}+{{z}^{2}}-2xy+3yz-4xz\]
D) \[{{a}^{2}}+{{b}^{2}}-{{c}^{2}}-2ab-2bc-2ac\]
Correct Answer: A
Solution :
(a): \[{{\left( -a+b+c \right)}^{2}}={{a}^{2}}+{{b}^{2}}+{{c}^{2}}-2ab+2bc-2ac\]
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