Answer
$(ax-b)(cx-d)$.
Work Step by Step
The given expression is
$=acx^2-bcx-adx+bd$
Group terms.
$=(acx^2-bcx)+(-adx+bd)$
Factor from each group.
$=cx(ax-b)-d(ax-b)$
Factor out $(ax-b)$.
$=(ax-b)(cx-d)$.
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