1. Chapter 14 Class 8 Factorisation
2. Concept wise
3. Finding Errors

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 = โ3 = ใ(โ3)ใ^2 + 5 (โ3) + 4 = (โ3 ร โ3) โ (5 ร 3) + 4 = 9 โ 15 + 4 = โ 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 = โ3 = ใ(โ3)ใ^2 โ 5 (โ3) + 4 = (โ3 ร โ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 = โ3 = ใ(โ3)ใ^2 + 5 (โ3) = (โ3 ร โ3) โ (5 ร 3) = 9 โ 15 = โ6 So, (โ3)2 + 5(โ3) = โ6 is the correct statement