_________ \/ 2*x + 1 > x
sqrt(2*x + 1) > x
___ [-1/2, 1 + \/ 2 )
x in Interval.Ropen(-1/2, 1 + sqrt(2))
/ ___\ And\-1/2 <= x, x < 1 + \/ 2 /
(-1/2 <= x)∧(x < 1 + sqrt(2))