Maharashtra Board Class 8 Maths Chapter 5 Expansion Formulae Practice Set 5.3 Solution
Question 1.Expand:i. (2m – 5)³ii. (4 – p)³iii. (7x – 9y)³iv. (58)³v. (198)³ Solution:i. Here, a = 2m and b = 5(2m – 5)³= (2m)³ – 3(2m)² (5) + 3(2m) (5)² – (5)³… [(a – b)³ = a³ – 3a²b + 3ab² – b³]= 8m³ – 3(4m²)(5) + 3(2m)(25) – 125= 8m³ – 60m² + … Read more