Question

For the problem
x²-5x+10=0 Should I leave the answer as {5±√(25-40)}/2 or 2.5, 1.936i and 2.5, -1936i

Answer 1

should have two answers + and negative

Answer 2

x^2-5x+10

= 7.73 / -2.26

Answer 3

If would leave them as
\[\frac{5}{2} \pm \frac{\sqrt{15}}{2} i\]
As a general rule, most mathematicians wouldn't convert this to a decimal because you lose accuracy by stopping at n decimal points, whatever n is; but the expression above is exact.