1.

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

Answer»

49a2 + 70ab + 25b2 

= (7a)2 + 2 (7a) (5b) + (5b)2 

= (7a + 5b)2 

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



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