Answer
$(x-2)(x+5)$
Work Step by Step
The given expression, $
x^2+3x-10
,$ has $c=
-10
$ and $b=
3
.$
The possible factors of $c$ are $
\{ 1,-10 \}
,\{ 2,-5 \}
,\{ -1,10 \}
,\{ -2,5 \}
$. Among these factors, the pair whose sum is equal to $b$ is $\{
-2,5
\}.$ Hence, the factored form is
\begin{array}{l}\require{cancel}
(x-2)(x+5)
.\end{array}