Example: Factorise 3a^{3}  6a^{2} + 3a
Solution:
 Factors of 3a^{3} are 1, 3, a, a^{2}, 3a, 3a^{2}, 3a^{3}
 Factors of 6a^{2} are 1. 6, a, a^{2}, 3a, 6a, 6a^{2}
 Factors of 3a are1, 3, a, 3a
 Common factor is 3a.
 Dividing 3a^{3}/3a + 6a^{2}/3a + 3a/3a = a^{2}  2a + 1
 factors are (a^{2}  2a + 1 ) 3a
Answer: (a^{2}  2a + 1 ) 3a
Directions: Factorise the following by HCF method.
