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`x(x-2)(x+3)(x^2 - 1)``x(x-2)(x-3)(x^2 +1)``x(x-2)(x-3) (x^2 - 1)` `x(x-2)(x+3) (x^2 +1)`

Answer :

C**Introduction of Factorisation**

**Factors **

**Factorization**

**Factors of a monomial**

**Common factors of two or more monomials**

**Greatest common factor (gcf) or highest common factor (hcf) The greatest common factors of given monomials is the common factor having a greatest coefficient and highest power of the variables.**

**Factorization of algebraic expressions when a common monomial factor occurs in each term**

**Factorizations of algebraic expressions when a binomial is a common factor**

**Grouping of the terms of an algebraic expression may lead to its factorization.**

**Factorize each of the following expressions : (i) `a^3 + a^2 (x-y) - a (y+z) - z` (ii) `(x^2+3x)^2 - 5 (x^2+3x) - y (x^2+3x) + 5y`**