Find the value of x cube - 8y cube - 36 xy -216 when x =2y+6
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x³-8y³-36xy-216
given that x = 2y+6
(2y+6)³-8y³-36(2y+6)y-216
= 8y³+216+(3×2y×6)(2y+6)-8y³- 36y(2y+6)-216
= 8y³-8y³+216-216+36y(2y+6)-36(2y+6)
=0
given that x = 2y+6
(2y+6)³-8y³-36(2y+6)y-216
= 8y³+216+(3×2y×6)(2y+6)-8y³- 36y(2y+6)-216
= 8y³-8y³+216-216+36y(2y+6)-36(2y+6)
=0
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