Question

$x3 - 9y3 + ( x + y)3$
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Answer 1

Answer:

= x3 - 3x2y + 3xy2 - 9y3

Step-by-step explanation:

= ((x3)-(9•(y3)))-3xy•(x-y)

=((x3) - 32y3) - 3xy • (x - y)

= x3-3x2y+3xy2-9y3 is not a perfect cube

= final result :x3 - 3x2y + 3xy2 - 9y3

hope it helps