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
https://www.meritnation.com/ask-answer/question/25a2-4b2-28bc-49c2/factorisation/1548908