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(x + y)² - 2xy = 2
(1)² - 2xy = 2
1 - 2xy = 2
- 2xy = 2-1
xy = -1/2
x³ + y³ = (x + y)³ - 3xy(x + y)
= (1)³ - 3(-1/2)(1)
= 1 + 3/2
= 2/2 + 3/2 = 5/2