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Ex 9.3, 4 - Chapter 9 Class 8 Algebraic Expressions and Identities - Part 3

Ex 9.3, 4 - Chapter 9 Class 8 Algebraic Expressions and Identities - Part 4
Ex 9.3, 4 - Chapter 9 Class 8 Algebraic Expressions and Identities - Part 5


Transcript

Ex 9.3, 4 (b) (b) Simplify a (a2 + a + 1) + 5 and find its value for (i) a = 0, (ii) a = 1 (iii) a = – 1. π‘Ž (π‘Ž^2+π‘Ž+1)+5 = (π‘ŽΓ—π‘Ž^2 )+(π‘ŽΓ—π‘Ž)+(π‘ŽΓ—1)+5 = π‘Ž^3+π‘Ž^2+π‘Ž+5 (i) For 𝒂=𝟎 Putting π‘Ž=0 in expression π‘Ž^3+π‘Ž^2+π‘Ž+5 = (0)^3+(0)^2+0+5 = 0+0+0+5 = πŸ“ (i) For 𝒂=𝟏 Putting π‘Ž=1 in expression π‘Ž^3+π‘Ž^2+π‘Ž+5 = γ€–(1)γ€—^3+ (1)^2+1+5 = 1+1+1+5 = πŸ– (iii) For 𝒂=βˆ’πŸ Putting π‘Ž=βˆ’1 in expression π‘Ž^3+π‘Ž^2+π‘Ž+5 = γ€–(βˆ’1)γ€—^3+ (βˆ’1)^2+(βˆ’1)+5 = (βˆ’1)^2Γ—(βˆ’1)+(1)+(βˆ’1)+5 = 1Γ—(βˆ’1)+1βˆ’1+5 = βˆ’1+1βˆ’1+5 = βˆ’2+6 = πŸ’

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.