Multiply x 2 - y 3 2 x 3 - 3 y 5

Given, x 2 - y 3 2 x 3 - 3 y 5 When multiplying polynomials, each term from one polynomial must be multiplied by each term of the other polynomial. And a a × a b = a a + b Now, x 2 - y 3 2 x 3 - 3 y 5 = x 2 2 x 3 - 3 y 5 - y 3 2 x 3 - 3 y 5 = x 2 × 2 x 3 - x 2 × 3 y 5 - y 3 × 2 x 3 + y 3 × 3 y 5 = x 2 3 - 3 y x 10 - 2 x y 9 + y 2 5

Multiply 2 a 2 9 - 1 7 3 a 5 - 2 5

Given, 2 a 2 9 - 1 7 3 a 5 - 2 5 When multiplying polynomials, each term from one polynomial must be multiplied by each term of the other polynomial. Now, 2 a 2 9 - 1 7 3 a 5 - 2 5 = 2 a 2 9 3 a 5 - 2 5 - 1 7 3 a 5 - 2 5 = 2 a 2 9 × 3 a 5 - 2 a 2 9 × 2 5 - 1 7 × 3 a 5 + 1 7 × 2 5 = 2 a 2 + 1 3 × 5 - 2 × 2 × a 2 9 × 5 - 3 a 7 × 5 + 1 × 2 7 × 5 = 2 a 3 15 - 4 a 2 45 - 3 a 35 + 2 35

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GANITPRABHA (MATHEMATICS TEXT BOOK) CLASS 7>Chapter 6 - Algebraic Operations>Let's do Ourselves

West Bengal Board Solutions for Chapter: Algebraic Operations, Exercise 21: Let's do Ourselves

Author:West Bengal Board

West Bengal Board Mathematics Solutions for Exercise - West Bengal Board Solutions for Chapter: Algebraic Operations, Exercise 21: Let's do Ourselves

Attempt the practice questions on Chapter 6: Algebraic Operations, Exercise 21: Let's do Ourselves with hints and solutions to strengthen your understanding. GANITPRABHA (MATHEMATICS TEXT BOOK) CLASS 7 solutions are prepared by Experienced Embibe Experts.