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

Transcript

Ex 12.3, 10 Simplify the expression and find its value when a = 5 and b = –3. 2(a2 + ab) + 3 – ab 2(a2 + ab) + 3 – ab = 2a2 + 2ab + 3 – ab = 2a2 + 3 + ab (2 − 1) = 2a2 + 3 + ab (1) = 2a2 + 3 + ab = 2a2 + ab + 3 Putting a = 5, b = −3 = 2(5)2 + (5) (−3) + 3 = 2 (25) − 15 + 3 = 50 − 12 = 38

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.