___ _________ \/ x + 1 >= \/ 3*x - 1
sqrt(x) + 1 >= sqrt(3*x - 1)
/ ___\ | 3 \/ 5 | And|1/3 <= x, x <= - + -----| \ 2 2 /
(1/3 <= x)∧(x <= 3/2 + sqrt(5)/2)
___ 3 \/ 5 [1/3, - + -----] 2 2
x in Interval(1/3, sqrt(5)/2 + 3/2)