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Ex 9.3, 5 - Chapter 9 Class 8 Algebraic Expressions and Identities - Part 2

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Ex 9.3, 5 (b) Add: 2x (z – x – y) and 2y (z – y – x) Simplifying expressions 2x (z – x – y) = 2𝑥 × z – 2𝑥 × 𝑥 – 2𝑥 × 𝑦 = 2𝑥z – 2𝑥^2 – 2𝑥𝑦 2y (z – y – x) = 2𝑦 × z – 2𝑦 × 𝑦 – 2𝑦 × 𝑥 = 2𝑦z – 2𝑦^2 – 2𝑥𝑦 Adding expressions So, our answer is −2x2 − 2y2 − 4xy + 2yz + 2zx

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.