1.

Expand : (a + b – c)2

Answer»

Replacing ‘c’ by ‘-c’ in the expansion of 

(a + b + c)2 = a2 + b2 + c2 + 2 ab + 2 bc + 2ca 

(a + b + (-c))2 = a2 + b2 + (-c)2 + 2ab + 2b(-c) + 2(-c)a 

= a2 + b2 + c2 + 2ab – 2bc – 2ca



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