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Ex 12.2, 2 - Chapter 12 Class 7 Algebraic Expressions - Part 6

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Ex 12.2, 2 Add: (vi) 5m – 7n, 3n – 4m + 2, 2m – 3mn – 5 (5m – 7n) + (3n – 4m + 2) + (2m – 3mn – 5) = 5m – 7n + 3n – 4m + 2 + 2m – 3mn – 5 = 5m – 4m + 2m – 7n + 3n – 3mn + 2 – 5 = m (5 – 4 + 2) + n (–7 + 3) –3mn + (2 – 5) = m(1 + 2) + n (–4) – 3mn + (–3) = m (3) – 4n –3mn – 3 = 3m – 4n – 3mn – 3

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