Question

find the value of x3+y3+15xy-125 if x+y=5

Answer 1

this is your answer

Answer 2

Answer:

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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