4a2 - 49b2 + 2a - 7b
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Given,
= (2a)2 - (7b)2 + 2a - 7b
= (2a + 7b)(2a - 7b) + (2a - 7b)
= (2a - 7b)(2a + 7b + 1).
Hence, 4a2 - 49b2 + 2a - 7b = (2a - 7b)(2a + 7b + 1).
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