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Class 7 - (Math )
Algebra - Identity
Which of the following is the expansion of (a - b + c)²?
a :
a² + b² + c² - 2ab - 2bc + 2ca
b :
a² + b² + c² - 2ab + 2bc - 2ca
c :
a² + b² + c² + 2ab - 2bc + 2ca
d :
a² + b² + c² - 2ab + 2ca
Explanation :
According to the constant equation, considering the signs, since the terms of b are negative, the terms where b occurs will be negative. (2ab and 2bc will be subtracted).