Find the value of x3 - 8y3 - 36xy - 216 when x = 2y + 6. from
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    Polynomials

    Multiple Choice QuestionsShort Answer Type

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    157. Find the value of x3 - 8y3 - 36xy - 216 when x = 2y + 6.

    We have    x = 2y + 6
    ⇒ x + (-2y) + (-6) = 0
    ∴ x3 + (-2y)3 + (-6)3 = 3x (-2y) (-6)
    ⇒     x3 - 8y3 - 216 = 36xy
    ∴ x3 - 8y3 - 36xy - 216 = 0

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