## 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.

### ICSE Class 9 Maths Chapter 5 Factorisation Revision Notes PDF