Question

introduction of factorisation

Answer 1

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Factorization is the decomposition of an object (for example, a number, a polynomial) into a product of other objects, or factors, which when multiplied together give the original. In this chapter we will learn about methods of factorization.
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Answer 2

Factorization is not usually considered meaningful within number systems possessing division, such as the real or complex numbers, since any {displaystyle x} can be trivially written as {\displaystyle (xy)\times (1/y)} whenever {\displaystyle y} is not zero. However, a meaningful factorization for a rational number or a rational function can be obtained by writing it in lowest terms and separately factoring its numerator and denominator.