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Ex 12.3, 7 - Chapter 12 Class 7 Algebraic Expressions - Part 2

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Ex 12.3, 7 Simplify these expressions and find their values if x = 3, a = –1, b = -2 (ii) 2 – 8x + 4x + 4 2 − 8x + 4x + 4 = x (−8 + 4) + (4 + 2) = x (−4) + 6 = −4x + 6 Putting 𝑥 = 3 = −4(3) + 6 = −12 + 6 = −6

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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.