Algebra Identities and Formulas

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Chapter 8 Class 8 Algebraic Expressions and Identities
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Ex 9.5, 1 - Chapter 9 Class 8 Algebraic Expressions and Identities - Part 10

 

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Question 1 Use a suitable identity to get each of the following products. (x) (7𝑎−9𝑏) (7𝑎−9𝑏) (7𝑎−9𝑏)^2 = (7𝑎)^2+ (9𝑏)^2−2(7𝑎)(9𝑏) = (7^2×𝑎^2 )+(9^2×𝑏^2 ) −(2×7×9)×𝑎×𝑏 = 49𝑎^2+81𝑏^2−(14×9)𝑎𝑏 = 𝟒𝟗𝒂^𝟐+𝟖𝟏𝒃^𝟐−𝟏𝟐𝟔𝒂𝒃

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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.