Example 10 - Chapter 9 Class 8 Algebraic Expressions and Identities
Last updated at Dec. 24, 2018 by Teachoo
Transcript
Example 10 Simplify (a + b) (2a โ 3b + c) โ (2a โ 3b) c. Here there are two expressions 1st expression = (๐+๐) (2๐โ3๐+๐) 2nd expression = (2๐โ3๐) ๐ Solving 1st expression (๐+๐) (2๐โ3๐+๐) = ๐(2๐โ3๐+๐)+๐(2๐โ3๐+๐) = (๐ร2๐)โ(๐ร3๐)+(๐ร๐)+(๐ร2๐)โ(๐ร3๐)+(๐ร๐) = 2๐^2โ3๐๐+๐๐+2๐๐โ3๐^2+๐๐ = 2๐^2โ3๐^2+๐๐+๐๐โ3๐๐ +2๐๐ = 2๐^2โ3๐^2+๐๐+๐๐โ๐๐ Solving 2nd expression (2๐โ3๐)๐ = 2๐๐โ3๐๐ Now, our expression is (๐+๐)(2๐โ3๐+๐)โ(2๐โ3๐)๐ = 2๐^2โ3๐^2+๐๐+๐๐โ๐๐โ(2๐๐โ3๐๐) = 2๐^2โ3๐^2+๐๐+๐๐โ๐๐โ2๐๐+3๐๐ = 2๐^2โ3๐^2โ๐๐+(๐๐โ2๐๐)+(๐๐+3๐๐) = ๐๐^๐โ๐๐^๐โ๐๐โ๐๐+๐๐๐
Examples
Example 1
Example 2 Important
Example 3
Example 4 Important
Example 5 (i)
Example 5 (ii) Important
Example 6 (i)
Example 6 (ii) Important
Example 7
Example 8 (i)
Example 8 (ii)
Example 9 (i)
Example 9 (ii) Important
Example 10 You are here
Example 11 (i)
Example 11 (ii) Important
Example 12 (i)
Example 12 (ii) Important
Example 13 (i)
Example 13 (ii) Important
Example 13 (iii)
Example 14 (i)
Example 14 (ii) Important
About the Author
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.