Last updated at Sept. 6, 2021 by Teachoo

Transcript

Ex 12.3, 7 Simplify these expressions and find their values if x = 3, a = –1, b = -2 (i) 3x – 5 – x + 9 3x – 5 – x + 9 = x (3 – 1) + (–5 + 9) = x (2) + 4 = 2x + 4 Putting 𝑥 = 3 = 2 (3) + 4 = 6 + 4 = 10

Ex 12.3

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Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.