Question 766326
Just be more careful about how you use text to express your expressions.

The work seems good.


{{{(3+-sqrt(9-4*1*4))/(2*1)}}}
{{{highlight((3+-sqrt(-7))/2)}}}
OR if you prefer,
{{{(3+-i*sqrt(7))/2}}}
OR still further,
{{{highlight((3/2)+-i*(1/2)*sqrt(7))}}}