Jika x + y = 1 dan x² + y² = 4, maka nilai x³ + y³ =

x+y=1

x²+y²=(x+y)²-2(xy)=4
(1)²-2(xy)=4
-2(xy)=3
xy=-3/2

x³+y³=(x+y)³-3(xy)(x+y)
(1)³-3(-3/2)(1)
1+9/2= 11/2