Question
If 3x + (1/3x) = 9 then find 27x³ + (1/27x³ ) =
?Solution
If 3x + (1/3x) =  N then 27x³ + (1/27x³) = N 3 -3N = 9 3- 3 x 9 = 729 - 27 = 702 ` `
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