Answer
$x^2-2x-24$
Work Step by Step
Using $(a+b)(c+d)=ac+ad+bc+bd$ or the Distributive Property, the given expression, $
(x+4)(x-6)
,$ is equivalent to
\begin{array}{l}\require{cancel}
x(x)+x(-6)+4(x)+4(-6)
\\\\=
x^2-6x+4x-24
\\\\=
x^2-2x-24
.\end{array}