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, Social Science, Physics, Chemistry, Computer Science at Teachoo.