4. (5a - 3 b-c) ²
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Step-by-step explanation:
(5a)² - 2 .5a.3b-c + ( 3b- c)²
25a² -30ab - 10ac + 9b² - 6bc + c²
25a² + 9b² + c² - 30ab - 10ac - 6bc
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