X3 + y3 + 9 x y - 27 if X + Y is equal to 3
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x³+y³+9xy-27
x³+y³+3xy(x+y)=27
x³+y³+9xy=27 -(1)
x³+y³+9xy-27
=27-27 {from (1)}
=0
x³+y³+3xy(x+y)=27
x³+y³+9xy=27 -(1)
x³+y³+9xy-27
=27-27 {from (1)}
=0
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