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Chapter 8 Class 8 Algebraic Expressions and Identities
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Question 7 (iv) - Algebra Identities and Formulas - Chapter 8 Class 8 Algebraic Expressions and Identities

Last updated at May 29, 2023 by

Ex 9.5, 7 - Chapter 9 Class 8 Algebraic Expressions and Identities - Part 4

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Transcript

Question 7 Using 𝑎^2−𝑏^2=(𝑎+𝑏)(𝑎−𝑏) , find (iv) 〖12.1〗^2−〖7.9〗^2 〖12.1〗^2−〖7.9〗^2 𝑎^2−𝑏^2=(𝑎+𝑏)(𝑎−𝑏) Putting 𝑎 = 12.1 & 𝑏 = 7.9 = (12.1+7.9)×(12.1−7.9) = 20×4.2 = 20×42/10 = 2×42 = 𝟖𝟒

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