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

Transcript

Example 8 Multiply (i) (π‘₯βˆ’4) and (2π‘₯+3) (π‘₯ βˆ’ 4)Γ—(2π‘₯+ 3) = π‘₯(2π‘₯+3)βˆ’4(2π‘₯+3) = π‘₯Γ—2π‘₯+π‘₯Γ—3βˆ’4Γ—2π‘₯βˆ’ 4Γ—3 = 2π‘₯^2+3π‘₯βˆ’8π‘₯βˆ’12 = πŸπ’™^πŸβˆ’πŸ“π’™βˆ’πŸπŸ Example 8 Multiply (ii) (π‘₯ – 𝑦) and (3π‘₯ +5𝑦) (π‘₯βˆ’π‘¦)Γ—(3π‘₯+5𝑦) = π‘₯(3π‘₯+5𝑦)βˆ’π‘¦(3π‘₯+5𝑦) = (π‘₯Γ—3π‘₯)+(π‘₯Γ—5𝑦)βˆ’(𝑦×3π‘₯)βˆ’(𝑦×5𝑦) = 3π‘₯^2+5π‘₯π‘¦βˆ’3𝑦π‘₯βˆ’5𝑦^2 = 3π‘₯^2+5π‘₯π‘¦βˆ’3π‘₯π‘¦βˆ’5𝑦^2 = πŸ‘π’™^𝟐+πŸπ’™π’šβˆ’πŸ“π’š^𝟐

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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.