find the value of x^3+y^3-12xy+64 when x+y= -4
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x+y = -4
Cubing on both sides
(x+y)³ = (-4)³
x³+y³+3xy(x+y) = -64
x³+y³+3xy(-4) = -64
x³+y³-12xy = -64
x³+y³-12xy + 64 = 0
Cubing on both sides
(x+y)³ = (-4)³
x³+y³+3xy(x+y) = -64
x³+y³+3xy(-4) = -64
x³+y³-12xy = -64
x³+y³-12xy + 64 = 0
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