Example 8 - Multiply (i) (x - 4) and (2x + 3) (ii) (x - y) (3x + 5y)

Example 8 - Chapter 9 Class 8 Algebraic Expressions and Identities - Part 2

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

Transcript

Example 8 Multiply (i) (๐‘ฅโˆ’4) and (2๐‘ฅ+3) (๐‘ฅ โˆ’ 4)ร—(2๐‘ฅ+ 3) = ๐‘ฅ(2๐‘ฅ+3)โˆ’4(2๐‘ฅ+3) = ๐‘ฅร—2๐‘ฅ+๐‘ฅร—3โˆ’4ร—2๐‘ฅโˆ’ 4ร—3 = 2๐‘ฅ^2+3๐‘ฅโˆ’8๐‘ฅโˆ’12 = ๐Ÿ๐’™^๐Ÿโˆ’๐Ÿ“๐’™โˆ’๐Ÿ๐Ÿ Example 8 Multiply (ii) (๐‘ฅ โ€“ ๐‘ฆ) and (3๐‘ฅ +5๐‘ฆ) (๐‘ฅโˆ’๐‘ฆ)ร—(3๐‘ฅ+5๐‘ฆ) = ๐‘ฅ(3๐‘ฅ+5๐‘ฆ)โˆ’๐‘ฆ(3๐‘ฅ+5๐‘ฆ) = (๐‘ฅร—3๐‘ฅ)+(๐‘ฅร—5๐‘ฆ)โˆ’(๐‘ฆร—3๐‘ฅ)โˆ’(๐‘ฆร—5๐‘ฆ) = 3๐‘ฅ^2+5๐‘ฅ๐‘ฆโˆ’3๐‘ฆ๐‘ฅโˆ’5๐‘ฆ^2 = 3๐‘ฅ^2+5๐‘ฅ๐‘ฆโˆ’3๐‘ฅ๐‘ฆโˆ’5๐‘ฆ^2 = ๐Ÿ‘๐’™^๐Ÿ+๐Ÿ๐’™๐’šโˆ’๐Ÿ“๐’š^๐Ÿ

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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.