25a^2-4b^2+28bc-49c^2
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Answer:
(5a)^2-[(2b)^2+2(2b)(7c)-(7c)^2]
(5a)^2-(2b+7c)^2
(5a+2b+7c)(5a-2b+7c)
Answered by
1
= 25a²-4b²+28bc-49c²
= (5a)²+(-2b)²+ 2(-2b)(-7c)+(-7c)²
= (5a)²+ (-2b-7c)²
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