Question 2 (vii) - Algebra Identities and Formulas - Chapter 8 Class 8 Algebraic Expressions and Identities

Last updated at August 14, 2026 by Teachoo

Ex 9.5, 2 - Chapter 9 Class 8 Algebraic Expressions and Identities - Part 7

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Transcript

Question 2 Use the identity (𝑥+𝑎)(𝑥+𝑏)=𝑥^2+(𝑎+𝑏)𝑥+𝑎𝑏 to find the following products. (vii) (𝑥𝑦𝑧−4) (𝑥𝑦𝑧−2) (𝑥𝑦𝑧−4) (𝑥𝑦𝑧−2) = (𝑥𝑦𝑧+(−4)) (𝑥𝑦𝑧+(−2)) (𝑡+𝑎)(𝑡+𝑏)=𝑡^2+(𝑎+𝑏)𝑡+𝑎𝑏 Putting 𝑡 = 𝑥𝑦𝑧 , 𝑎 = −4 & 𝑏 = −2 = (𝑏)^2+(7)^2−2(𝑏)(7) = 𝑏^2+49−(2×7)×𝑏 = 𝒃^𝟐+𝟒𝟗−𝟏𝟒𝒃

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