Example 5 (ii) - Chapter 8 Class 8 Algebraic Expressions and Identities
Last updated at Dec. 16, 2024 by Teachoo
Last updated at Dec. 16, 2024 by Teachoo
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