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Factorise using appropriate identities :49a^2 + 70ab + 25b^2

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Factorise using appropriate identities :49a2 + 70ab + 25b2

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49a2 + 70ab + 25b2 

= (7a)2 + 2 (7a) (5b) + (5b)2 

= (7a + 5b)2 

= (7a + 5b)(7a + 5b)

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