Question

(3x+Y)^3 -(3x-Y)^3. ​

Answer 1

Answer:

2y (y^2 + 9x^2)

Step-by-step explanation:

(3x+y)^3 - (3x-y)^3

= (27x^3 + y^3 + 9x^2y + 3xy^2) - (27x^3 - y^3 - 9x^2y + 3xy^2)

= 27x^3 + y^3 + 9x^2y + 3xy^2 - 27x^3 + y^3 + 9x^2y - 3xy^2

= 2y^3 + 18x^2y

= 2y (y^2 + 9x^2)