Question

8-6a-9a²+27a³
Factorise​

Answer 1

Answer:

$= {(3a)}^{3} - 3.(3a).{2}^{2} - 3. {(3a)}^{2}.2 + {2}^{3} \\ = {(3a - 2)}^{3}$

Answer 2

Thoughtfully split the expression at hand into groups, each group having two terms :

Group 1:  -6a+8 

Group 2:  27a3-9a2 

Pull out from each group separately :

Group 1:   (3a-4) • (-2)

Group 2:   (3a-1) • (9a2)