Question

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

Answer 1

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Answer 2

Answer: 0

EXPLANATION

x = 2y+6

⇒ x - 2y = 6      ...... (i)

cutting both sides

⇒ x³ - 8y³ - 6xy(x - 2y) = 216

⇒ x³ - 8y³ - 6xy(6) = 216      {since , x - 2y = 6 from i}

⇒x³ - 8y³ - 36xy - 216 = 0

so the value of x³ - 8y³ - 36xy - 216 = 0