Solve Bug?

[Helge Gabert]

There are older threads about this problem, with solve() sometimes returning wrong results (e.g., an erroneous zero as a solution for polynomials with degenerate roots, or for highly factorizable polynomials). I have found it helpful to

a) test explicitly for the solutions offered, i.e., solve(your polynomial here, x=0) returns 0.5
b) run solve with a bracket for the solutions, i.e solve(your polynomial here, x=-5..5) returns [-2 .5 2 2.5].