Скачать или смотреть Class 9 Math | Chapter 4 – Algebraic Manipulation

📘 Class 9 Math | Chapter 4 – Algebraic Manipulation

Exercise 4.2 | Complete Solution | Federal Board

Welcome to this helpful lecture on Class 9 Mathematics (Federal Board).
In today’s video, we will fully solve Exercise 4.2 from Chapter 4: Algebraic Manipulation of the National Book Foundation textbook.

This exercise focuses on Factorization using special identities, including:
✔️ a³ + b³ formula
✔️ a³ – b³ formula
✔️ Difference of squares (a² – b²)
✔️ Common factor technique
✔️ Recognizing algebraic patterns

The video explains every question step by step so students can understand the concept clearly and score full marks in Board Exams.


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🔍 What You Will Learn in This Video

⭐ How to factorize expressions easily
⭐ How to use cubic identities correctly
⭐ How to avoid common mistakes
⭐ Shortcut tricks for solving exercise questions
⭐ Complete solution of Ex 4.2 with clear explanations


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📚 Important Formulas Used

a³ + b³ = (a + b)(a² – ab + b²)
a³ – b³ = (a – b)(a² + ab + b²)
a² – b² = (a – b)(a + b)
Common Factor → taking out the greatest common algebraic term


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