25a²-4b²+28bc-49c²=25a²-[4b²-28bc+49c²]
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Step-by-step explanation:
=25a²-4b+28bc-49c²
=25a²-4b+28bc-49c²
=(5a)²-(2b)²+2×2b×7c-(7c)²
=5a²-{2b-7c}² [a²+2ab-b²=(a+b)²
=(5a²+2b-7c) (5a²-2b-7c) [a²-b²=(a+b)]
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