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Transcript

Question 2 Use the identity (𝑥+𝑎)(𝑥+𝑏)=𝑥^2+(𝑎+𝑏)𝑥+𝑎𝑏 to find the following products. (ii) (4𝑥+5)(4𝑥+1) (4𝑥+5)(4𝑥+1) (𝑦+𝑎)(𝑦+𝑏)=𝑦^2+(𝑎+𝑏)𝑦+𝑎𝑏 Putting 𝑦 = 4𝑥 , 𝑎 = 5 & 𝑏 = 1 = (4𝑥)^2+(5+1)(4𝑥)+(5)(1) = (4^2×𝑥^2 )+(6×4)𝑥+5 = 𝟏𝟔𝒙^𝟐+𝟐𝟒𝒙+𝟓

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

About the Author

Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science and Computer Science at Teachoo