Numerical approximations are always returned for roots of polynomials of degree 5 and higher. You can change the number of digits used in the display of these roots by making changes in the Settings box.
Polynomials + Roots
5x5 +5x4 -10x3 -10x2 + 5x + 5, roots:
1.0 1.0 -1.0 -1.0 -1.0
x8 + x7 + x6 + x5 + x4 + x3 + x2 + x + 1, roots:
- .93969262 - .34202014i - .93969262 + .34202014i - .5 - .8660254i - .5 + .8660254i .17364818 - .98480775i .17364818 + .98480775i .76604444 - .64278761i .76604444 + .64278761i