Ex 10.2, 4 - Chapter 10 Class 7 Algebraic Expressions

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Ex 10.2, 4 If a = 2, b = – 2, find the value of: (i) a2 + b2a2 + b2 Putting a = 2, b = −2 = (2)2 + (−2)2 = 4 + 4 = 8 Ex 10.2, 4 If a = 2, b = – 2, find the value of: (ii) a2 + ab + b2a2 + ab + b2 Putting a = 2, b = −2 = (2)2 + (2)(−2) + (−2)2 = 4 − 4 + 4 = 0 + 4 = 4 Ex 10.2, 4 If a = 2, b = – 2, find the value of: (iii) a2 – b2a2 – b2 Putting a = 2, b = −2, = (2)2 − (−2)2 = 4 − 4 = 0

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science and Computer Science at Teachoo