Answer
$x^2+11x+24$
Work Step by Step
Using $(a+b)(c+d)=ac+(ad+bc)+bd$, or the FOIL Method, the given expression, $
(x+3)(x+8)
,$ is equivalent to
\begin{array}{l}\require{cancel}
x^2+(8x+3x)+24
\\\\=
x^2+11x+24
.\end{array}
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