Question
If x/y + y/x = 1 and x + y = 2, then the value of x³ +
y³ is:Solution
Simplify= x/y + y/x = 1 (x2+y2)/xy =1  x² + y² = xy Use the identity. x³ + y³ = (x+y) (x² - xy + y²): =2(xy-xy) =2×0 x³ + y³=0
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