Slide3.JPG

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

Transcript

Ex 9.4, 1 Multiply the binomials. (iii) (2.5๐‘™ โ€“ 0.5๐‘š) and (2.5๐‘™ + 0.5๐‘š) (2.5๐‘™ โ€“ 0.5๐‘š)(2.5๐‘™ + 0.5๐‘š) = 2.5๐‘™(2.5๐‘™+0.5๐‘š)โˆ’0.5๐‘š(2.5๐‘™+0.5๐‘š) = (2.5๐‘™ร—2.5๐‘™)+(2.5๐‘™ร—0.5๐‘š)โˆ’(0.5๐‘šร—2.5๐‘™)โˆ’(0.5๐‘šร—0.5๐‘š) = (25๐‘™/10ร—25๐‘™/10)+(25๐‘™/10ร—5๐‘š/10)โˆ’(5๐‘š/10ร—25๐‘™/10)โˆ’(5๐‘š/10ร—5๐‘š๐‘™/10) = 625/100ร—(๐‘™ร—๐‘™)+125/100 (๐‘™ร—๐‘š)โˆ’(125/100)ร—(๐‘šร—๐‘™)โˆ’(25/100)ร—(๐‘š ร— ๐‘š) = 6.25๐‘™^2+1.25๐‘™๐‘šโˆ’1.25๐‘™๐‘šโˆ’0.25๐‘š^2 = ๐Ÿ”.๐Ÿ๐Ÿ“๐’^๐Ÿโˆ’๐ŸŽ.๐Ÿ๐Ÿ“๐’Ž^๐Ÿ

About the Author

Davneet Singh's photo - Teacher, Computer Engineer, Marketer
Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.