find (a+b+c) whole square -(a-b-c) whole sqare
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( a+b+c )² - ( a-b-c )²
→ { a² + b² + c² + 2ab + 2bc + 2ac } - { a² + b² + c² + 2a(-b) + 2(-b)(-c) + 2a(-c) }
→ ( a² + b² + c² + 2ab + 2bc + 2ac ) - ( a² + b² + c² -2ab + 2bc - 2ac )
→ a² + b² + c² + 2ab + 2bc + 2ac - a² - b² - c² + 2ab - 2bc + 2ac
→ a² - a² + b² - b² + c² - c² + 2ab + 2ab + 2bc - 2bc + 2ac + 2ac
→ 4ab + 4ac
→ 4a ( b + c ).......Ans
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