find the value of x^3+y^3-12xy+64 when x+y =-4
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x+y=-4
x=-(4+y)
{-(4+y)} ^3+y^3-12(-4-y) y+64
-64-y^3-48y-12y^2+y^3+48y+12y^2+64 = 0
x=-(4+y)
{-(4+y)} ^3+y^3-12(-4-y) y+64
-64-y^3-48y-12y^2+y^3+48y+12y^2+64 = 0
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