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

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  1. Chapter 9 Class 8 Algebraic Expressions and Identities
  2. Serial order wise

Transcript

Ex 9.5, 7 Using ๐‘Ž^2โˆ’๐‘^2=(๐‘Ž+๐‘)(๐‘Žโˆ’๐‘) , find (iv) ใ€–12.1ใ€—^2โˆ’ใ€–7.9ใ€—^2 ใ€–12.1ใ€—^2โˆ’ใ€–7.9ใ€—^2 ๐‘Ž^2โˆ’๐‘^2=(๐‘Ž+๐‘)(๐‘Žโˆ’๐‘) Putting ๐‘Ž = 12.1 & ๐‘ = 7.9 = (12.1+7.9)ร—(12.1โˆ’7.9) = 20ร—4.2 = 20ร—42/10 = 2ร—42 = ๐Ÿ–๐Ÿ’

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