# Ex 12.3, 1 - Chapter 12 Class 7 Algebraic Expressions

Last updated at Dec. 21, 2018 by Teachoo

Last updated at Dec. 21, 2018 by Teachoo

Transcript

Ex 12.3, 1 If m = 2, find the value of: (i) m – 2 m − 2 Putting m = 2 = 2 − 2 = 0 Ex 12.3, 1 If m = 2, find the value of: (ii) 3m – 5 3m − 5 Putting m = 2 = 3 (+2) − 5 = + 6 − 5 = 1 Ex 12.3, 1 If m = 2, find the value of: (iii) 9 – 5m 9 − 5m Putting m = 2 = 9 − 5(2) = 9 – 10 = –1 Ex 12.3, 1 If m = 2, find the value of: (iv) 3m2 – 2m – 7 3m2 – 2m – 7 Putting m = 2 = 3(2)2 − 2 − 7 = 3(4) − 4 − 7 = 12 − 11 = 1 Ex 12.3, 1 If m = 2, find the value of: (v) 5𝑚/2 4 5𝑚/2 − 4 Putting m = 2 = (5 (2))/2 − 4 = 5 − 4 = 1

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.