Ex 12.2, 2 - Chapter 12 Class 7 Algebraic Expressions - Part 3

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  1. Chapter 12 Class 7 Algebraic Expressions
  2. Serial order wise

Transcript

Ex 12.2, 2 Add: (iii) – 7mn + 5, 12mn + 2, 9mn – 8, – 2mn – 3 (–7mn + 5) + (12mn + 2) + (9mn – 8) + (–2mn – 3) = –7mn + 5 + 12mn + 2 + 9mn – 8 – 2mn – 3 = –7mn + 12mn + 9mn – 2mn + 5 + 2 – 8 – 3 = mn (–7 + 12 + 9 – 2) + (5 + 2 – 8 – 3) = mn (12 + 9 – 7 – 2) + (5 + 2 – 8 – 3) = mn (21 – 9) + (7 – 11) = mn (12) + (– 4) = 12mn – 4

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