Question

8) Factorise each of the following do step by step:-

(a) 8x3 + 729 + 108x2 + 486x
(b) a2 + b2 + 2ab + 2bc + 2ca
(c) x 3 – 3x 2 – 9x – 5

Answer 1

1. use formula (a+b)^3=a^3+b^3+3ab(a+b)

(2x+9)^3