x=2y+4 then find the value of x^3-8y^3-24xy
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=x cube - 8y cube - 24xy
let's put the value of x we get,
=(2y+4)cube - (8y) cube - 24y (2y+4)
=8y cube + 48y square +96y+64 - 8y cube - 48y square - 96y
=64
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