Chapter 5 · Class 8 ICSE · Formula Sheet

Algebraic Expressions Formulas — Class 8 ICSE

Work with polynomials, perform operations on algebraic expressions, and learn identities.

Key Formulas

Identity 1

(a + b)^2 = a^2 + 2ab + b^2

Identity 2

(a - b)^2 = a^2 - 2ab + b^2

Identity 3

(a + b)(a - b) = a^2 - b^2

Identity 4

(x + a)(x + b) = x^2 + (a+b)x + ab

Worked Examples

1Using: Linear Equation

Solve 3x + 5 = 20.

Step 1: 3x = 20 - 5 = 15.

Step 2: x = 15 / 3 = 5.

Answer: x = 5

2Using: Algebraic Identity

Expand (a + 3)^2.

Step 1: Using (a + b)^2 = a^2 + 2ab + b^2

Step 2: = a^2 + 6a + 9.

Answer: a^2 + 6a + 9

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More Class 8 ICSE Formulas

Rational NumbersExponents & PowersSquares & Square RootsCubes & Cube RootsFactorizationLinear Equations in One Variable

Frequently Asked Questions

How many formulas are in Class 8 ICSE Algebraic Expressions?+
There are 4 formulas in the Algebraic Expressions chapter for Class 8 ICSE. Each formula is essential for solving problems in this topic.
How to remember Algebraic Expressions formulas easily?+
Practice regularly with worked examples, group related formulas together, and use SparkEd's interactive practice mode to reinforce your memory through problem-solving.
Are these Algebraic Expressions formulas enough for exams?+
Yes, these formulas cover the complete ICSE Class 8 syllabus for Algebraic Expressions. Practice applying them to different types of questions for full exam readiness.

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