It can be determined by solving the equation:
x2-x3 = 1
x2(1-x) = 1
x = - 1/(1-x)1/2
(It can be shown by sketch that the root is negative)
By iteration, the root is -0.755 (3 s.f.)
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eight
eight ( 8 )
8. Details: 8 = 2^3 (a cube) 8+1 = 9 9 = 3^2 (a square)
26
8 is the only one I can think of it's 2^3 and it's one less then 9 (3^2) hope this helps =D