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Simplify (i) (6a-7a+2c)²(ii) (2a+3b)³ |
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Answer» ONG>Answer: Simplify : i. (6a - 7b +2c)² Using the IDENTITY (a + b + c)² = a² + b² + c² +2ab +2 bc + 2ca We have , (6a)² - (7b)² + (2c)² - 2.6a.7b - 2.7b.2c + 2.2c.6a = 36a² - 49b² + 4c² - 84ab - 28bc + 24ca ______________________________Using the identity (a + b)³ = a³ + b³ + 3ab (a + b) We have, (2a + 3b)³ = (2a)³ + (3b)³ + 3.2a.3b (2a + 3b) = 8a³ + 27b³ + 18ab (2a + 3b) |
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