Find the value of x cube + y cube + 15 x y - 125 if x + y = 5
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2
Answer:
0
Step-by-step explanation:
x+y=5
Then,
x³+y³+15xy-125
=x³+y³+3xy×5-125
=x³+y³+3xy(x+y) - 5³
=(x+y)³-5³
=5³-5³
=0
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