RS Aggarwal Class 8 Maths Factorisation

FACTORISATION

Factors : When an algebraic expression can be written as the product of two or more expressions, then each of these expressions is called a factor of the given expression.

Factorisation: The process of finding two or more expressions whose product is the given expression is called factorisation.

Ex 7A

1.

Answer:

          (i)  12x + 15 = 3(4x + 5)

          (ii) 14m - 21 = 7(2m - 3)

          (iii) 9n – 12n² = 3n(3 – 4n )

2.

Answer :

          (i) 16a² – 24 ab = 8a(2a – 3b)

          (ii) 15ab² – 20 a²b = 5ab(3b – 4a)

          (iii) 12x²y³ – 21x³y² = 3x²y²(4y – 7x)