Answer
See the work step by step section.
Work Step by Step
$x^2-x+1>0$, since its determinant ($b^2-4ac=(-1)^2-4\cdot1\cdot1=-3$) is negative ($-3$), it has only positive values (also because the leading coefficient, $1$ is positive), hence the solution set is empty. (also, see the graph of $x^2-x+1$)