Question

What is the expanded form of ( x + 3y )³​

Answer 1

x³ + 9x²y + 27xy² + 27y³

Explanation:

( x + 3y )² =

(x + 3y)(x + 3y) =

x² + 3xy + 3yx + 9y² =

x² + 6xy + 9y²

(x + 3y)(x² + 6xy + 9y²) =

x³ + 6x²y + 9xy² + 3yx² + 18xy² + 27y³ =

x³ + 9x²y + 27xy² + 27y³

Hope this helps :)

Answer 2

Expand it into 3 columns and expand it one by one