Question 1 (x) - Algebra Identities and Formulas - Chapter 8 Class 8 Algebraic Expressions and Identities

Last updated at August 14, 2026 by

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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