4a2 - 12a + 9 - 49b2
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Given,
= (2a)2 - 2 × 2a × 3 + (3)2 - (7b)2
= (2a - 3)2 - (7b)2
= (2a - 3 + 7b)(2a - 3 - 7b).
Hence, 4a2 - 12a + 9 - 49b2 = (2a - 3 + 7b)(2a - 3 - 7b).
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4a2 - (4b2 + 4bc + c2)
4a2 - 49b2 + 2a - 7b
4xy - x2 - 4y2 + z2
a2 + b2 - c2 - d2 + 2ab - 2cd