Factorise
x^3 - 8y^3 - 36xy - 216 , when x=2y+6
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ANSWER
x3−8y3−36xy−216
=x3+(−2y)3+(−6)3−3(x)(−2y)(−6)
=(x−2y−6)(x2+4y2+36+2xy−12y+6x)
=0×(x2+4y2+36+2xy−12y+6x)
=0
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