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  1. Chapter 14 Class 8 Factorisation
  2. Serial order wise

Transcript

Ex 14.4, 10 Find and correct the errors in the following mathematical statements. Substituting x = โ€“ 3 in (a) ๐‘ฅ^2 + 5x + 4 gives ใ€–"(โ€“ 3)" ใ€—^2+ 5 (โ€“ 3) + 4 = 9 + 2 + 4 = 15 ๐‘ฅ^2 + 5x + 4 Putting x = โˆ’3 = ใ€–(โˆ’3)ใ€—^2 + 5 (โˆ’3) + 4 = (โˆ’3 ร— โˆ’3) โˆ’ (5 ร— 3) + 4 = 9 โˆ’ 15 + 4 = โˆ’ 2 So, (โ€“3)2 + 5(โ€“3) + 4 = โ€“2 is the correct statement Ex 14.4, 10 Find and correct the errors in the following mathematical statements. Substituting x = โ€“ 3 in (b) ๐‘ฅ^2 โ€“ 5x + 4 gives ใ€–"(โ€“ 3)" ใ€—^2โ€“ 5 ( โ€“ 3) + 4 = 9 โ€“ 15 + 4 = โ€“ 2 ๐‘ฅ^2 + 5x + 4 Putting x = โˆ’3 = ใ€–(โˆ’3)ใ€—^2 โˆ’ 5 (โˆ’3) + 4 = (โˆ’3 ร— โˆ’3) + (5 ร— 3) + 4 = 9 + 15 + 4 = 28 So, (โ€“3)2 โ€“ 5(โ€“3) + 4 = 28 is the correct statement Ex 14.4, 10 Find and correct the errors in the following mathematical statements. Substituting x = โ€“ 3 in (c) ๐‘ฅ^2+ 5x gives ใ€–"(โ€“ 3)" ใ€—^2+ 5 (โ€“3) = โ€“ 9 โ€“ 15 = โ€“ 24 ๐‘ฅ^2 + 5x Putting x = โˆ’3 = ใ€–(โˆ’3)ใ€—^2 + 5 (โˆ’3) = (โˆ’3 ร— โˆ’3) โˆ’ (5 ร— 3) = 9 โˆ’ 15 = โˆ’6 So, (โ€“3)2 + 5(โ€“3) = โ€“6 is the correct statement

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.