find the value of x3+y3-12xy+64,when x+y= -4

find it's value by using identity.....i'm facing a problem..;(
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1 Answer

(x+y)3=x3+3xy(x+y)+y3=-43=-64, because x+y=-4

x3+y3-12xy=-64, x3+y3-12xy+64=0.

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