If x + y = 1, then the value of (x3 + y3 + 3xy) is?

We know that algebraic formula,
(x + y)³ = x³ + y³ + 3xy (x + y)
put the value of x + y in given equation. [ given, x + y = 1]
1 = x³ + y³ + 3xy X 1
⇒ x³ + y³ + 3xy = 1