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Question 3 Find the following squares by using the identities. (vi) (2𝑥𝑦+5𝑦)^2 (2𝑥𝑦+5𝑦)^2 (𝑎+𝑏)^2=𝑎^2+𝑏^2+2𝑎𝑏 Putting 𝑎 = 2𝑥𝑦 & 𝑏 = 5𝑦 = (2𝑥𝑦)^2+(5𝑦)^2+2(2𝑥𝑦)(5𝑦) = (2^2×𝑥^2×𝑦^2 )+(5^2×𝑦^2 )+(2×2×5)×𝑥×(𝑦×𝑦) = 𝟒𝒙^𝟐 𝒚^𝟐+𝟐𝟓𝒚^𝟐+𝟐𝟎𝒙𝒚^𝟐

  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