Question

If x + y = 3, then find the value of x^3 + y^3 – 27 + 9xy

Answer 1

Answer:

0 [zero]

Step-by-step explanation:

--> (x³ + y³) = (x + y)*(x²-xy-y²) = 3*(x²-xy-y²)

--> 3*(x²-xy-y²) = 3x²-3xy-3y²

--> (3x²-3xy-3y² )+9xy = 3*(x+y)² = 27