25 a square minus 4 b square + 28 B C - 49 c square
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25a² - 4b² + 28bc - 49c²
(by rearranging them)
25a² - 4b² - 49c² + 28bc
(by using (a - b)² identity)
25a² - ( 2b - 7c )²
(by using a² - b² identity)
(5a - 2b + 7c) (5a + 2b - 7c)
Hope this helps
@PoojaBBSR
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