Example 5 (ii) - Chapter 8 Class 8 Algebraic Expressions and Identities

Last updated at Dec. 16, 2024 by

Example 5 - Chapter 9 Class 8 Algebraic Expressions and Identities - Part 2

Example 5 - Chapter 9 Class 8 Algebraic Expressions and Identities - Part 3

 

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Transcript

Example 5 Simplify the expressions and evaluate them as directed: (ii) 3𝑦(2𝑦−7)−3(𝑦−4)−63 for 𝑦=−2 3𝑦(2𝑦−7)−3(𝑦−4)−63 =3𝑦×2𝑦−3𝑦×7−3×𝑦+3×4−63 =6𝑦^2−21𝑦−3𝑦+12−63 =6𝑦^2−24𝑦−51 For y = −𝟐 Putting 𝑦=−2 in expression 6𝑦^2−24𝑦−51 = 6(−2)^2−24(−2)−51 =6×4+24×2−51 = 24+48−51 = 72−51 = 𝟐𝟏

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science and Computer Science at Teachoo