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प्रश्न
Simplify: (5a + 5b – c) (2b – 3c)
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उत्तर
(5a + 5b - c) (2b - 3c)
= 5a (2b - 3c) + 5b (2b - 3c) - c (2b - 3c)
= 10ab - 15ac + 10b(1+1) - 15bc - 2bc + 3c(1+1)
= 10ab - 15ac + 10b2 - 17bc + 3c2
Hence, (5a + 5b - c) (2b - 3c)
= 10ab - 15ac + 10b2 - 17bc + 3c2
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