Identities — Formula Sheet
ICSE · Class 8 · Mathematics
7 formulas from Identities (ICSE Class 8 Mathematics) on one page, grouped by topic. Part of the ICSE Class 8 Mathematics syllabus.
Interactive on Super Tutor
Studying Identities? Get the full interactive chapter.
Quizzes, flashcards, AI doubt-solver and a step-by-step study plan — built for formula sheet and more.
Free trial, no card needed.
Formulas and Key Relations
2. Special Products of Two Binomials
(x + a)(x + b) = x^2 + (a + b)x + ab
3. Product of Sum and Difference
(x + y)(x - y) = x^2 - y^2
x^2 - y^2 = (x + y)(x - y)
4. Expansions of Squares
(a + b)^2 = a^2 + b^2 + 2ab
(a + 1/a)^2 = a^2 + 1/a^2 + 2
(a + b + c)^2 = a^2 + b^2 + c^2 + 2(ab + bc + ca)
Key relations
Also, (a + b - c)^2 = a^2 + b^2 + c^2 + 2ab - 2bc - 2ca = a^2 + b^2 + c^2 + 2(ab - bc - ca).
Full sheet with units and worked examples
View AllFrequently Asked Questions
What are the important topics in Identities for ICSE Class 8 Mathematics?
How many formulas are in Identities?
How should I revise Identities for Class 8 exams?
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
More resources for Identities
Practice Quiz
Test yourself with a quick quiz
Important Questions
Exam-style questions with answers
Revision Notes
Key points for last-minute revision
Chapter Summary
Understand the chapter at a glance
Concept Maps
See how topics connect
Study Plan
Step-by-step plan for this chapter
Flashcards
Quick-fire cards for active recall
Syllabus
What topics to cover
For serious students
Get the full Identities chapter — start free.
Quizzes, flashcards, an AI doubt solver and a study plan for ICSE Class 8 Mathematics. Free to start, no card needed.