(3x+Y)^3 -(3x-Y)^3. – InterviewSolution

1.

(3x+Y)^3 -(3x-Y)^3.

Answer» ONG>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)

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