Find the value of x³ + y³ - 12xy + 64, when x + y = -8
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Answer:
x³+y³-12xy+64
where x+y = -8
=512-12(-8)+64
=512+94+64
=512+158
=670
as x+y = -8,
we take x³+y³= 8³= 512
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