Question

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

Answer 1

Answer:

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Answer 2

Answer:

x = 2y + 6

x - 3y = 6

Cubing both sides

x³ - (2y)³ - 3 × x × 2y (x - 2y) = 6³

x³ - 8y³ - 3 × x × 2y ×6 = 216

x³ - 8y³ - 36xy - 216 = 0

Hence the proof follows