Answer
$\sqrt{13}$
Work Step by Step
Substituting the given values of the variables, the expression $\sqrt{b^2-4ac}$ evaluates to
\begin{array}{l}\require{cancel}
\sqrt{(-3)^2-4(1)(-1)}
\\\\=
\sqrt{9+4}
\\\\=
\sqrt{13}
.\end{array}
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