What are the factors of 4 a 2 − 25 c 2 + 9 b 2 − 12 ab?
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4a² – 25c² + 9b² – 12ab
= {(2a)² – 12ab + (3b)²} – 25c²
= (2a – 3b)² – (5c)²
= (2a – 3b + 5c) (2a – 3b –5c)
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