Ex 9.5, 4 - Chapter 9 Class 8 Algebraic Expressions and Identities - Part 2

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Ex 9.5, 4 - Chapter 9 Class 8 Algebraic Expressions and Identities - Part 3

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

Transcript

Ex 9.5, 4 Simplify. (ii) (2π‘₯+5)^2βˆ’(2π‘₯βˆ’5)^2 Solving (πŸπ’™+πŸ“)^𝟐 (π‘Ž+𝑏)^2=π‘Ž^2+𝑏^2+2π‘Žπ‘ Putting π‘Ž = 2π‘₯ & 𝑏 = 5 = (2π‘₯)^2+(5)^2+2(2π‘₯)(5) = 4π‘₯^2+25+20π‘₯ Solving (πŸπ’™βˆ’πŸ“)^𝟐 (π‘Žβˆ’π‘)^2=π‘Ž^2+𝑏^2βˆ’2π‘Žπ‘ Putting π‘Ž = 2π‘₯ & 𝑏 = 5 = (2π‘₯)^2+(5)^2βˆ’2(2π‘₯)(5) = 4π‘₯^2+25βˆ’20π‘₯ = 4π‘₯^2+25+20π‘₯βˆ’4π‘₯^2βˆ’25+20π‘₯ = (4π‘₯^2βˆ’4π‘₯^2 )+(25βˆ’25)+(20π‘₯+20π‘₯) = 0+0+40π‘₯ = πŸ’πŸŽπ’™

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