If x=2y+6, then find the value of x^3-8y^3 -36xy-216
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if x= 2y+6
t
put the value of x in equation
t
put the value of x in equation
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(2y+6)^3-8y^3-36y(2y+6)-216
8y^3+216-8y^3-72y^2-216y-216
=(-72y^2)-216y
=(-9y)(8y+24)
8y^3+216-8y^3-72y^2-216y-216
=(-72y^2)-216y
=(-9y)(8y+24)
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