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From this section you can download / view Video Lectures on all subjects for all 6th, 7th, 8th, 9th and 10th classes/grades free of cost. The Videos for class 9th and 10th classes are prepared by SABAK Foundation for the ease of students as per new and updated syllabus/course prescribed by Federal Board of Intermediate & Secondary Education (FBISE), Islamabad – Pakistan and other BISE(s)/Boards of Pakistan and Directorate of Education, Islamabad – Pakistan. We are fully hopeful that after after watching/viewing these Video Lectures you will score 90% plus marks in your exams as they have been prepared in a very simple, easy, brief and in simple and lucid language to understand. For any queries you can contact us. We recommend you to like our Facebook Fan page for latest updates and new posts. You can also get our latest posts via Email directly in your Email Inbox by clicking here.

## Chapter 2: Theory of Quadratic Equations (43 videos)

### 2.1: Nature of the Roots of a Quadratic Equation

- Discriminant of Quadratic Expression
- Problem 1: Discriminant of Quadratic Expression
- Finding Discriminant of Quadratic Equation
- Problem 1: Finding Discriminant of Quadratic Equation
- Nature of the Roots of a Quadratic Equation
- Problem 1: Nature of the Roots of a Quadratic Equation
- Verification of Nature of Roots of Equation
- Finding s when Nature of Roots is given
- Problem 1: Finding s when Nature of Roots is given

### 2.2: Cube Roots of Unity and Their Properties

- The Cube Roots of Unity
- Problem 1: The Cube Roots of Unity
- Recognise Complex Cube Roots of Unity
- Properties of Cube Roots of Unity
- Problem 1: Properties of Cube Roots of Unity
- Problems on Cube Roots of Unity
- Problem 1: Problems on Cube Roots of Unity

### 2.3: Roots and Co-Efficient of a Quadratic Equation

- Roots & Coefficients of Quadratic Equation
- Problem 1: Roots & Coefficients of Quadratic Equation
- Finding Sum of Roots from Their Product
- Problem 1: Finding Sum of Roots from Their Product
- Finding Sum of Roots from Their Square
- Problem 1: Finding Sum of Roots from Their Square
- Two Roots Differ by a Given Number
- Roots Satisfy a Given Relation
- Sum & Product of Roots Equal to a Number

### 2.4: Symmetric Functions of the Roots of a Quadratic Equation

- Symmetric Functions of Roots Equation
- Problem 1: Symmetric Functions of Roots Equation
- More on Symmetric Functions of Roots Equation

### 2.5: Formation of a Quadratic Equation

- Find a Quadratic Equation from Given Roots
- Form Quadratic Equations Whose Roots are Given
- Problem 1: Form Quadratic Equations Whose Roots are Given

### 2.6: Synthetic Division

- Synthetic Division Method
- Finding Quotient & Remainder
- Problem 1: Finding Quotient & Remainder
- Finding s when Zeros of a Polynomial are Given
- Finding s when Factors of a Polynomial are Given
- Solve a Cube Equation, If a Root of Equation is Given
- Problem 1: Solve a Cube Equation, If a Root of Equation is Given
- Solving Quartic Equation, If Roots are Given
- Problem 1: Solving Quartic Equation, If Roots are Given

### 2.7: Simultaneous Equations

- Solving Simultaneaous Quadratic Equations
- Problem Leading to Quadratic Equations
- Problem 1: Problem Leading to Quadratic Equations

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