Answer
$(x-a)(x-b)$
Work Step by Step
Using factoring by grouping, the given expression, $
x^2-ax-bx+ab
,$ is equivalent to
\begin{array}{l}\require{cancel}
(x^2-ax)-(bx-ab)
\\\\=
x(x-a)-b(x-a)
\\\\=
(x-a)(x-b)
.\end{array}
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