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# ICSE Class 9 Maths Chapter 5 Factorisation Revision Notes

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## ICSE Class 9 Maths Chapter 5 Factorisation Revision Notes

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## Factorisation

Factorisation or factoring is the decomposition of an object (for example, a number, a polynomial, or a matrix) into a product of other objects, or factors, which when multiplied together give the original.
For example, the number 15 factors into primes as 3 × 5, and the polynomial x^2 − 4 factors as (x − 2) (x + 2).
In all cases, a product of simpler objects is obtained. It is actually the opposite of expansion.

Methods of factorization:

1. Taking out the common factors.
2. Grouping
3. Splitting of the middle terms.
4. Difference of two squares.
5. The sum or difference of two cubes.