Factorise - 25-a square-b square-2ab

25-a2-b2-2ab

25-(a2+b2+2ab)                    (As Sign Changes When Minus Is Outside The Bracket

52-(a+b)2

(5+a+b)(5-a-b)       (Using a2-b2 = (a+b)*(a-b)

 

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