Find the value of x power 3 + y power 3 + 15 x y - 125 if x + y is equal to 5
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x+y = 5
(x+y)^3 = 125
x^3 + y^3 + 3x^2y + 3xy^2 = 125
x^3+y^3+3xy(x+y) = 125
x^3+y^3+15xy = 125
x^3+y^3+15xy-125 = 0.
(x+y)^3 = 125
x^3 + y^3 + 3x^2y + 3xy^2 = 125
x^3+y^3+3xy(x+y) = 125
x^3+y^3+15xy = 125
x^3+y^3+15xy-125 = 0.
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