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Factorise completely : a^2 + 2ab + b^2 – c^2​​​​​​​

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Factorise completely : a2 + 2ab + b2 – c2 

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a2 + 2ab + b2 – c2 = (a2 + 2ab + b2)- c2 

= (a + b)2 - (c)2 

= (a + b + c) ( a + b - c)

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