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Example 12 - Chapter 9 Class 8 Algebraic Expressions and Identities - Part 2

Example 12 - Chapter 9 Class 8 Algebraic Expressions and Identities - Part 3

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Transcript

Example 12 Using Identity (II), find (ii) (4.9)^2 (4.9)^2 = (5βˆ’0.1)^2 (π‘Žβˆ’π‘)^2=π‘Ž^2+𝑏^2βˆ’2π‘Žπ‘ Putting π‘Ž = 5 & 𝑏 = 0.1 = (5)^2+(0.1)^2βˆ’2(5)(0.1) = 25+(1/10)^2βˆ’(2Γ—5Γ—1/10) = 25+1^2/γ€–10γ€—^2 βˆ’(10/10) = 25+1/100βˆ’1 = 24+1/100 = (24 Γ— 100 + 1)/100 = (2400 + 1)/100 = 2401/100 = πŸπŸ’.𝟎𝟏

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Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths and Science at Teachoo.