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Tim Wessman · (This post was last modified: 10-03-2017 09:27 PM by Tim Wessman.)

I haven't checked with the release version, but in my local version I get back:

solve(x^4-3*x^3-2.75*x^2+12*x-5,x) ----> {-2.,0.5,2.,2.5}

So I'm assuming there was a problem fixed in the CAS at some point.

In the meantime, just stick your input into solve(exact(x^4-3*x^3-2.75*x^2+12*x-5),x)) to work around it (will automatically convert to fractions like you noted works fine). The CAS definitely doesn't like working with approximate numbers in general, but it has gotten much, much better then it was in the past.