Question

Factorise a-3b + a cube - 27 b cube

Answer 1

Answer:

it may help u

Step-by-step explanation:

2b+3b-9b-27

2(b+3)-9(b+3)

2-9=0 , b+3=0

x=9/2 , x=-3

Answer 2

Answer:

answer is=(a-3b)(1+a^2+3ab+9b^2)

Step-by-step explanation:

a-3b+a^3-27b^3...

=(a-3b)+(a-3b)^3

=(a-3b)+(a-3b)(a^2-3ab+(3b)^2)

=(a-3b)+(a-3b)(a^2-3ab+9b^2)

taking (a-3b) common....

(a-3b)(1+a^2+3ab+9b^2) ans..

Hope it helps...