Answer
$(x+7)(x-4)$
Work Step by Step
Using factoring by grouping, the given expression, $
x^2+7x-4x-28
,$ is equivalent to
\begin{array}{l}\require{cancel}
(x^2+7x)-(4x+28)
\\\\=
x(x+7)-4(x+7)
\\\\=
(x+7)(x-4)
.\end{array}
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