If xy (x + y) = m, then the value of (x³ + y³

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If xy (x + y) = m, then the value of (x³ + y³ + 3m) is :

1. m³
  xy
2. m³
  (x + y)³
3. m³
  x³y³
4. mx³ y³

Correct Option: C

xy (x + y) = m (Given)
∴ x³ + y³ + 3m
= x³ + y³ + 3xy (x + y)

= (x + y)³ =		m		³	=	m³
		xy				x³y³