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 Curious Cubic Triplet(s) (Posted on 2009-05-16)
Determine all possible triplet(s) (a, b, c) of positive real numbers, with a ≤ b ≤ c, that satisfy the following system of equations:

a3 – 3a = b, and:

b3 – 3b = c, and:

c3 – 3c = a

 No Solution Yet Submitted by K Sengupta No Rating

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 too bad they all have to be positive (spoiler present) Comment 2 of 2 |
(In reply to Analytic solution by Daniel)

Otherwise

` a                b                c   0.2410733605106 -0.7092097740851  1.77091205130640.4450418679126 -1.2469796037175  1.80193773580480.7092097740851 -1.7709120513064 -0.2410733605106 *0.8677674782351 -1.9498558243636 -1.5636629649361 * 1.1361294934623 -1.9418836348521 -1.4970214963422 *1.2469796037175 -1.8019377358048 -0.4450418679126 *1.4970214963422 -1.1361294934623  1.94188363485211.5636629649361 -0.8677674782351  1.94985582436361.7709120513064  0.2410733605106 -0.70920977408511.8019377358048  0.4450418679126 -1.24697960371751.9418836348521  1.4970214963422 -1.13612949346231.9498558243636  1.5636629649361 -0.86776747823512.0000000000000  2.0000000000000  2.0000000000000 *`
` `

though only those marked * can be cycled into an ascending series.

 Posted by Charlie on 2009-05-16 17:04:01

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