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

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Ex 9.5, 7 Using π‘Ž^2βˆ’π‘^2=(π‘Ž+𝑏)(π‘Žβˆ’π‘) , find (iv) γ€–12.1γ€—^2βˆ’γ€–7.9γ€—^2 γ€–12.1γ€—^2βˆ’γ€–7.9γ€—^2 π‘Ž^2βˆ’π‘^2=(π‘Ž+𝑏)(π‘Žβˆ’π‘) Putting π‘Ž = 12.1 & 𝑏 = 7.9 = (12.1+7.9)Γ—(12.1βˆ’7.9) = 20Γ—4.2 = 20Γ—42/10 = 2Γ—42 = πŸ–πŸ’

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