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