25a2 4b2 + 28bc 49c2

factorise it.

 If your question is  25a 2 − 4b 2 + 28bc − 49c 2  then here is the link to answer: 
https://www.meritnation.com/ask-answer/question/25a2-4b2-28bc-49c2/factorisation/1548908

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