Find the value of x^3+y^3+15xy-125,when x+y=5
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x^3 + y^3 + (-5)^3 -3*x*y*(-5)
If x+y =5
x+y-5=0
(x+y-5)(x^2 + y^2 + (-5)^2 +xy -5y -5x)
0*(x^2+y^2+25+xy-5y-5x)
0
If x+y =5
x+y-5=0
(x+y-5)(x^2 + y^2 + (-5)^2 +xy -5y -5x)
0*(x^2+y^2+25+xy-5y-5x)
0
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