Question
If 3x + (1/3x) = 8 then find 27x3 +
(1/27x3) = ?Solution
If 3x + (1/3x)  = N then 27x 3 + (1/27x 3) =  N3 - 3N = 83 - 3 x 8 = 512 - 24 = 488 ` `
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