Solve if x=2y+6 find the value of x3-8y3 - 36xy-216
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This is your answer. If the value of Y is given then you put the value of Y in your answer
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so given
x = 2y+6
⇒ x - 2y = 6 ...... (i)
cubing 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 ANSWER
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