Let's Recall Solutions | Lesson 5 Expansion Formulae | Class 8 Maths English Medium | Maharashtra Board
Let's Recall – Lesson 5 Expansion Formulae Welcome to Rukmini Classes. In this post, you will find the complete Let's Recall solutions of Lesson 5 – Expansion Formulae for Class 8 Maths (English Medium), Maharashtra Board. All answers are explained in a simple, step-by-step method to help students understand the concepts easily, complete their homework, and prepare for exams with confidence. Let's begin with the Let's Recall solutions! Chapter 5 : Expansion Formulae LET'S RECALL Formulae 1. (a + b)² = a² + 2ab + b² 2. (a - b)² = a² - 2ab + b² 3. (a + b)(a - b) = a² - b² (i) (x+2y)² Formula Used: (a+b)²=a²+2ab+b² Solution: Take a=x and b=2y. (x+2y)²=x²+2(x)(2y)+(2y)² =x²+4xy+4y² Answer: 4xy (ii) (2x-5y)² Formula Used: (a-b)²=a²-2ab+b² Solution: Take a=2x and b=5y. (2x-5y)²=(2x)²-2(2x)(5y)+(5y)² =4x²-20xy+25y² Answer: Boxes: 4x², 25y² (iii) (101)²=(100+1)²=□+□+1²=□ Formula Used: (a+b)²=a²+2ab+b² Solution: Here, a=100 and b=1. (100+1)²=100²+2(100)(1...