find the value of x3+y3+15xy-125 if x+y=5
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30xy
Step-by-step explanation:
x³ + y³ + 15xy - 125 ---------eq1
we know that: x+y=5
(x+y)³ = x³+y³+3xy(x+y)
putting eq1 into the property:
= x³ + y³ + 3xy(x+y) + 15xy -125
= (5)³ + 3xy(5) + 15xy - 125
= 125 + 15xy +15xy -125
= 30xy
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