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Find the value of x³+y³+15xy-125 if x+y=5
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Answer:
X³+y³+15xy-125
=x³ + y³ +3 xy ×5 - 125
=x³ + y³ +3xy(x+y) - (5)³
= (x+y) ³ - (5)³
=(5)³ - (5)³
=0...(ans)
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