Ex 9.5, 7 - Using a^2 - b^2 = (a + b) (a - b), find (i) 51^2 - 49^2

 

 

  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 (i) ใ€–51ใ€—^2โˆ’ใ€–49ใ€—^2 ใ€–51ใ€—^2โˆ’ใ€–49ใ€—^2 ๐‘Ž^2โˆ’๐‘^2=(๐‘Ž+๐‘)(๐‘Žโˆ’๐‘) Putting ๐‘Ž = 51 & ๐‘ = 49 = (51+49)ร—(51โˆ’49) = 100ร—2 = ๐Ÿ๐ŸŽ๐ŸŽ

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.