simplyfy: (5a-5b-c) (2b-3c).
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Answer:
simplyfy: (5a-5b-c) (2b-3c).
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(5a + 5b - c) (2b - 3c)
= 5a(2b - 3c) + 5b(2b - 3c) - c(2b - 3c)
= 10ab - 15ac + 10b² - 15ac - 2bc + 3c²
= 10ab - 10b² - 17bc - 15ac + 3c²
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