If x - 2 Y = 11 and X Y = 8 find the value of x cube - 8 y cube
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we have x-2y =11 and XY=8
therefore cubing both sides
(x-2y)=11
x cube -8y cube -3.x.2y(x-2y)=1331
x cube - 8y cube -6(8)(11)=1331
x cube -8y cube-528=1331
therefore x cube - 8y cube =1331-528
=803
therefore cubing both sides
(x-2y)=11
x cube -8y cube -3.x.2y(x-2y)=1331
x cube - 8y cube -6(8)(11)=1331
x cube -8y cube-528=1331
therefore x cube - 8y cube =1331-528
=803
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