If x + y = 6 and x2 + y3 = 72. Find xy.
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=>(x+y) =6[Given]
Cubing both sides,
=>(x+y) ³=(6)³
=>(x)³+(y)³+3×x×y(x+y)=216
=>x³+y³+3xy×6=216[(x+y)=6]
=>72+18xy=216
=>18xy=216-72
=>18xy=144
=>xy=144/18
=>xy=8
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