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16x²+y²=65/36 (4x)²+(y)²=65/36 (4x+y)²-8xy==65/36 (4x+y)²==65/ | Algebra Quint

16x²+y²=65/36
(4x)²+(y)²=65/36
(4x+y)²-8xy==65/36
(4x+y)²==65/36+16/36
(4x+y)²=81/36
(4x+y)==9/6

64x³+y³+12xy(9/6)==729/216
64x³+y³=729/216 - 1
64x³+y³=(729-216)/216
64x³+y³=171/72==19/8