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

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Ex 9.5, 2 Use the identity (π‘₯+π‘Ž)(π‘₯+𝑏)=π‘₯^2+(π‘Ž+𝑏)π‘₯+π‘Žπ‘ to find the following products. (vii) (π‘₯π‘¦π‘§βˆ’4) (π‘₯π‘¦π‘§βˆ’2) (π‘₯π‘¦π‘§βˆ’4) (π‘₯π‘¦π‘§βˆ’2) = (π‘₯𝑦𝑧+(βˆ’4)) (π‘₯𝑦𝑧+(βˆ’2)) (𝑑+π‘Ž)(𝑑+𝑏)=𝑑^2+(π‘Ž+𝑏)𝑑+π‘Žπ‘ Putting 𝑑 = π‘₯𝑦𝑧 , π‘Ž = βˆ’4 & 𝑏 = βˆ’2 = (𝑏)^2+(7)^2βˆ’2(𝑏)(7) = 𝑏^2+49βˆ’(2Γ—7)×𝑏 = 𝒃^𝟐+πŸ’πŸ—βˆ’πŸπŸ’π’ƒ

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